1.
Shore
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A shore or a shoreline is the fringe of land at the edge of a large body of water, such as an ocean, sea, or lake. Shores are influenced by the topography of the landscape, as well as by water induced erosion. The geological composition of rock and soil dictates the type of shore which is created, Riviera is an Italian word for shoreline, ultimately derived from Latin ripa. It came to be applied as a name to the coast of the Ligurian Sea, in the form riviera ligure. Historically, the Ligurian Riviera extended from Capo Corvo south of Genoa, north and west into what is now French territory past Monoco, now it is divided into the Italian Riviera and the French Riviera. Although the French use the term Riviera to refer to the Italian Riviera, as a result of the fame of the Ligurian rivieras, the term came into English to refer to any shoreline, especially one that is sunny, topographically diverse and popular with tourists. Such places using the term include the Australian Riviera in Queensland, offshore or Intertidal zone Ballantine Scale Coastal path Shorezone Anders, F. J. and Byrnes, M. R. Accuracy of shoreline change rates as determined from maps and aerial photographs Shore and Beach, v.59, processes influencing the transport and fate of contaminated sediments in the coastal ocean—Boston Harbor and Massachusetts Bay, U. S. Geological Survey Circular 1302, pp. 1–89. Equilibrium beach profiles—characteristics and applications Journal of Coastal Research, v.7, the Budget of Littoral Sediments—Concepts and Applications Shore and Beach, v.64, pp. 18–26. Meade, R. H. Sources, sinks and storage of river sediments in the Atlantic drainage of the United States Journal of Geology, v.90, an Assessment of the Nations Shorelines, USA Shore and Beach v.71, no. Stockdon, H. F. Sallenger, A. H. List, J. H. and Holman, estimation of shoreline position and change using airborne topographic lidar data Journal of Coastal Research, v.18, no. The use of models to predict beach behavior for U. S. coastal engineering—A critical review Journal of Coastal Research, v.16. Media related to Shores at Wikimedia Commons shore, the American Heritage Dictionary of the English Language
2.
Littoral zone
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The littoral zone is the part of a sea, lake or river that is close to the shore. In coastal environments the littoral zone extends from the water mark. It always includes this intertidal zone and is used to mean the same as the intertidal zone. However, the meaning of littoral zone can extend well beyond the intertidal zone, what is regarded as the full extent of the littoral zone, and the way the littoral zone is divided into subregions, varies in different contexts. The use of the term varies from one part of the world to another. For example, military commanders speak of the littoral in ways that are different from marine biologists. The adjacency of water gives a number of characteristics to littoral regions. The erosive power of water results in particular types of landforms, such as sand dunes, the natural movement of the littoral along the coast is called the littoral drift. Biologically, the availability of water enables a greater variety of plant and animal life. In addition, the local humidity due to evaporation usually creates a microclimate supporting unique types of organisms. The word littoral is used both as a noun and an adjective and it derives from the Latin noun litus, litoris, meaning shore. In oceanography and marine biology, the idea of the zone is extended roughly to the edge of the continental shelf. Starting from the shoreline, the zone begins at the spray region just above the high tide mark. From here, it moves to the region between the high and low water marks, and then out as far as the edge of the continental shelf. These three subregions are called, in order, the zone, the eulittoral zone and the sublittoral zone. The supralittoral zone is the area above the high tide line that is regularly splashed. Seawater penetrates these elevated areas only during storms with high tides, organisms here must cope also with exposure to fresh water from rain, cold, heat and predation by land animals and seabirds. At the top of this area, patches of dark lichens can appear as crusts on rocks, some types of periwinkles, Neritidae and detritus feeding Isopoda commonly inhabit the lower supralittoral
3.
Intertidal zone
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The intertidal zone, also known as the foreshore and seashore and sometimes referred to as the littoral zone, is the area that is above water at low tide and under water at high tide. This area can include different types of habitats, with many types of animals, such as starfish, sea urchins. The well-known area also includes rocky cliffs, sandy beaches. The area can be a strip, as in Pacific islands that have only a narrow tidal range. Organisms in the zone are adapted to an environment of harsh extremes. The intertidal zone is home to many several species from different taxa including Porifera, Annelids, Coelenterates, Mollusks, crustaceans, Arthropods. Water is available regularly with the tides but varies from fresh with rain to highly saline, wave splash can dislodge residents from the littoral zone. With the intertidal zones high exposure to the sun, the range can be anything from very hot with full sun to near freezing in colder climates. Some microclimates in the zone are ameliorated by local features. Adaptation in the littoral zone allows the use of nutrients supplied in high volume on a basis from the sea. Edges of habitats, in this land and sea, are themselves often significant ecologies. Along most shores, the zone can be clearly separated into the following subzones, high tide zone, middle tide zone. The intertidal zone is one of a number of biomes or habitats, including estuaries, neritic, surface. Marine biologists divide the region into three zones, based on the overall average exposure of the zone. The low intertidal zone, which borders on the shallow subtidal zone, is exposed to air at the lowest of low tides and is primarily marine in character. The mid intertidal zone is exposed and submerged by average tides. The high intertidal zone is covered by the highest of the high tides. The high intertidal zone borders on the splash zone, on shores exposed to heavy wave action, the intertidal zone will be influenced by waves, as the spray from breaking waves will extend the intertidal zone
4.
West Coast, New Zealand
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The West Coast is a region of New Zealand on the west coast of the South Island, one of the more remote and most sparsely populated areas of the country. It is administered by the West Coast Regional Council, at the territorial authority level, the region comprises Buller District, Grey District and Westland District. The principal towns are Westport, Greymouth, and Hokitika, fiordland is on the west coast, but is in the Southland Region rather than the West Coast Region. Inhabitants of the West Coast are colloquially known as Coasters, the region reaches from Kahurangi Point in the north to Awarua Point in the south, a distance of 600 km. To the west is the Tasman Sea, and to the east are the Southern Alps, much of the land is rugged, with a coastal plain where much of the population resides. The land is very scenic, with wild coastlines, mountains, scenic areas include the Haast Pass, Fox and Franz Josef Glaciers, the Pancake Rocks at Punakaiki and the Heaphy Track. The region has a high rainfall due to the prevailing northwesterly wind pattern and the location of the Southern Alps. The rain shadow effect is responsible for the arid climate of the Canterbury Plains on the other side of the Southern Alps. The regions area is 23,276 km2 and it is divided into the three districts of Buller, Grey and Westland. Industries on the West Coast include mining for coal and alluvial gold, forestry and wood processing, dairy farming has grown strongly - the local dairy co-operatives Westland Milk Products remained independent when most others merged to form Fonterra in 2001. Other industries are the manufacturing and sales of greenstone jewellery, sphagnum moss gathering, the sub-national GDP of the region was estimated at US$779 million in 2003, 1% of national GDP. The region is home to Māori, who valued it for the greenstone found there in abundance, the region was only occasionally visited by Europeans until the discovery of gold near the Taramakau River in 1864 by two Māori, Ihaia Tainui and Haimona Taukau. By the end of the year there were an estimated 1800 prospectors, many of them around the Hokitika area, after that time, the population dwindled, but the main towns that still exist had become established. Following greenstone and gold, the valuable mineral was coal. Discovered near the Buller River in the mid-1840s, mining began in earnest during the 1860s, by the 1880s coal had become the region’s main industry, with mines throughout the northern half of the region, especially around Westport. Many of these continued in operation until the mid-20th century, timber has also long been a major industry, although in recent years there has been an uneasy balance between forestry for wood and forestry for conservation. Much of the region is public land administered by the Department of Conservation, ecotourism is now an important industry, and this goes hand in hand with the conservation efforts. The region is populated, especially in the south, with the 2006 census recording 31,326 inhabitants, up from 30,303 in 2001
5.
New Zealand
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New Zealand /njuːˈziːlənd/ is an island nation in the southwestern Pacific Ocean. The country geographically comprises two main landmasses—the North Island, or Te Ika-a-Māui, and the South Island, or Te Waipounamu—and around 600 smaller islands. New Zealand is situated some 1,500 kilometres east of Australia across the Tasman Sea and roughly 1,000 kilometres south of the Pacific island areas of New Caledonia, Fiji, because of its remoteness, it was one of the last lands to be settled by humans. During its long period of isolation, New Zealand developed a distinct biodiversity of animal, fungal, the countrys varied topography and its sharp mountain peaks, such as the Southern Alps, owe much to the tectonic uplift of land and volcanic eruptions. New Zealands capital city is Wellington, while its most populous city is Auckland, sometime between 1250 and 1300 CE, Polynesians settled in the islands that later were named New Zealand and developed a distinctive Māori culture. In 1642, Dutch explorer Abel Tasman became the first European to sight New Zealand, in 1840, representatives of Britain and Māori chiefs signed the Treaty of Waitangi, which declared British sovereignty over the islands. In 1841, New Zealand became a colony within the British Empire, today, the majority of New Zealands population of 4.7 million is of European descent, the indigenous Māori are the largest minority, followed by Asians and Pacific Islanders. Reflecting this, New Zealands culture is derived from Māori and early British settlers. The official languages are English, Māori and New Zealand Sign Language, New Zealand is a developed country and ranks highly in international comparisons of national performance, such as health, education, economic freedom and quality of life. Since the 1980s, New Zealand has transformed from an agrarian, Queen Elizabeth II is the countrys head of state and is represented by a governor-general. In addition, New Zealand is organised into 11 regional councils and 67 territorial authorities for local government purposes, the Realm of New Zealand also includes Tokelau, the Cook Islands and Niue, and the Ross Dependency, which is New Zealands territorial claim in Antarctica. New Zealand is a member of the United Nations, Commonwealth of Nations, ANZUS, Organisation for Economic Co-operation and Development, Pacific Islands Forum, and Asia-Pacific Economic Cooperation. Dutch explorer Abel Tasman sighted New Zealand in 1642 and called it Staten Landt, in 1645, Dutch cartographers renamed the land Nova Zeelandia after the Dutch province of Zeeland. British explorer James Cook subsequently anglicised the name to New Zealand, Aotearoa is the current Māori name for New Zealand. It is unknown whether Māori had a name for the country before the arrival of Europeans. Māori had several names for the two main islands, including Te Ika-a-Māui for the North Island and Te Waipounamu or Te Waka o Aoraki for the South Island. Early European maps labelled the islands North, Middle and South, in 1830, maps began to use North and South to distinguish the two largest islands and by 1907, this was the accepted norm. The New Zealand Geographic Board discovered in 2009 that the names of the North Island and South Island had never been formalised and this set the names as North Island or Te Ika-a-Māui, and South Island or Te Waipounamu
6.
Sea
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A sea is a large body of salt water that is surrounded in whole or in part by land. More broadly, the sea is the system of Earths salty. The sea moderates Earths climate and has important roles in the cycle, carbon cycle. Although the sea has been traveled and explored since prehistory, the scientific study of the sea—oceanography—dates broadly to the British Challenger expedition of the 1870s. Owing to the present state of continental drift, the Northern Hemisphere is now equally divided between land and sea but the South is overwhelmingly oceanic. Salinity in the ocean is generally in a narrow band around 3. 5% by mass, although this can vary in more landlocked waters, near the mouths of large rivers. About 85% of the solids in the sea are sodium chloride. Deep-sea currents are produced by differences in salinity and temperature, surface currents are formed by the friction of waves produced by the wind and by tides, the changes in local sea level produced by the gravity of the Moon and Sun. The direction of all of these is governed by surface and submarine land masses, former changes in sea levels have left continental shelves, shallow areas in the sea close to land. The most diverse areas surround great tropical coral reefs, whaling in the deep sea was once common but whales dwindling numbers prompted international conservation efforts and finally a moratorium on most commercial hunting. Life may have started there and aquatic microbial mats are generally credited with the oxygenation of Earths atmosphere, the sea is an essential aspect of human trade, travel, mineral extraction, and power generation. It is the scene of activities including swimming, diving, surfing. However, population growth, industrialization, and intensive farming have all contributed to marine pollution. Atmospheric carbon dioxide is being absorbed in increasing amounts, lowering its pH in a known as ocean acidification. The shared nature of the sea has made overfishing an increasing problem, both senses of sea date to Old English, the larger sense has required a definite article since Early Middle English. Seas are generally larger than lakes and contain salt water, while the defining elements of size and being bounded are generally used, there is no formally accepted technical definition of sea among oceanographers. In international law, the United Nations Convention on the Law of the Sea states that all the ocean is the sea. Earth is the known planet with seas of liquid water on its surface, although Mars possesses ice caps
7.
Ocean
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An ocean is a body of saline water that composes much of a planets hydrosphere. On Earth, an ocean is one of the major divisions of the World Ocean. These are, in descending order by area, the Pacific, Atlantic, Indian, Southern, the word sea is often used interchangeably with ocean in American English but, strictly speaking, a sea is a body of saline water partly or fully enclosed by land. The ocean contains 97% of Earths water, and oceanographers have stated that less than 5% of the World Ocean has been explored, the total volume is approximately 1.35 billion cubic kilometers with an average depth of nearly 3,700 meters. As the world ocean is the component of Earths hydrosphere, it is integral to all known life, forms part of the carbon cycle. The world ocean is the habitat of 230,000 known species, but because much of it is unexplored, the origin of Earths oceans remains unknown, oceans are thought to have formed in the Hadean period and may have been the impetus for the emergence of life. Extraterrestrial oceans may be composed of water or other elements and compounds, the only confirmed large stable bodies of extraterrestrial surface liquids are the lakes of Titan, although there is evidence for the existence of oceans elsewhere in the Solar System. Early in their histories, Mars and Venus are theorized to have had large water oceans. The Mars ocean hypothesis suggests that nearly a third of the surface of Mars was once covered by water, compounds such as salts and ammonia dissolved in water lower its freezing point so that water might exist in large quantities in extraterrestrial environments as brine or convecting ice. Unconfirmed oceans are speculated beneath the surface of many planets and natural satellites, notably. The Solar Systems giant planets are thought to have liquid atmospheric layers of yet to be confirmed compositions. Oceans may also exist on exoplanets and exomoons, including surface oceans of water within a circumstellar habitable zone. Ocean planets are a type of planet with a surface completely covered with liquid. The concept of Ōkeanós has an Indo-European connection, Greek Ōkeanós has been compared to the Vedic epithet ā-śáyāna-, predicated of the dragon Vṛtra-, who captured the cows/rivers. Related to this notion, the Okeanos is represented with a dragon-tail on some early Greek vases, though generally described as several separate oceans, these waters comprise one global, interconnected body of salt water sometimes referred to as the World Ocean or global ocean. This concept of a body of water with relatively free interchange among its parts is of fundamental importance to oceanography. The major oceanic divisions – listed below in descending order of area and volume – are defined in part by the continents, various archipelagos, Oceans are fringed by smaller, adjoining bodies of water such as seas, gulfs, bays, bights, and straits. The Mid-Oceanic Ridge of the World are connected and form the Ocean Ridge, the continuous mountain range is 65,000 km long, and the total length of the oceanic ridge system is 80,000 km long
8.
Lake
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A lake is an area of variable size filled with water, localized in a basin, that is surrounded by land, apart from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, and therefore are distinct from lagoons, Lakes can be contrasted with rivers or streams, which are usually flowing. Most lakes are fed and drained by rivers and streams, natural lakes are generally found in mountainous areas, rift zones, and areas with ongoing glaciation. Other lakes are found in endorheic basins or along the courses of mature rivers, in some parts of the world there are many lakes because of chaotic drainage patterns left over from the last Ice Age. All lakes are temporary over geologic time scales, as they will fill in with sediments or spill out of the basin containing them. The word lake comes from Middle English lake, from Old English lacu, from Proto-Germanic *lakō, cognates include Dutch laak, Middle Low German lāke as in, de, Moorlake, de, Wolfslake, de, Butterlake, German Lache, and Icelandic lækur. Also related are the English words leak and leach, none of these definitions completely excludes ponds and all are difficult to measure. For this reason, simple size-based definitions are used to separate ponds. One definition of lake is a body of water of 2 hectares or more in area, however, others have defined lakes as waterbodies of 5 hectares and above, or 8 hectares and above. Charles Elton, one of the founders of ecology, regarded lakes as waterbodies of 40 hectares or more. The term lake is used to describe a feature such as Lake Eyre. In common usage, many bear names ending with the word pond. One textbook illustrates this point with the following, In Newfoundland, for example, almost every lake is called a pond, whereas in Wisconsin, the majority of lakes on Earth are fresh water, and most lie in the Northern Hemisphere at higher latitudes. Canada, with a drainage system has an estimated 31,752 lakes larger than 3 square kilometres and an unknown total number of lakes. Finland has 187,888 lakes 500 square metres or larger, most lakes have at least one natural outflow in the form of a river or stream, which maintain a lakes average level by allowing the drainage of excess water. Some lakes do not have an outflow and lose water solely by evaporation or underground seepage or both. Many lakes are artificial and are constructed for power generation, aesthetic purposes, recreational purposes, industrial use. Globally, lakes are greatly outnumbered by ponds, of an estimated 304 million standing water bodies worldwide, 91% are 1 hectare or less in area
9.
Coastline paradox
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The coastline paradox is the counterintuitive observation that the coastline of a landmass does not have a well-defined length. This results from the properties of coastlines. The first recorded observation of this phenomenon was by Lewis Fry Richardson, more concretely, the length of the coastline depends on the method used to measure it. Various approximations exist when specific assumptions are made about minimum feature size, the basic concept of length originates from Euclidean distance. In the familiar Euclidean geometry, a straight line represents the shortest distance between two points, this line has only one length, the length of basic curves is more complicated but can also be calculated. Using shorter and shorter lines will produce sums that approach the true length. A precise value for this length can be established using calculus, the following animation illustrates how a smooth curve can be meaningfully assigned a precise length, However, not all curves can be measured in this way. A fractal is by definition a curve whose complexity changes with measurement scale, whereas approximations of a smooth curve get closer and closer to a single value as measurement precision increases, the measured value of fractals may change wildly. However, this relies on the assumption that space can be subdivided indefinitely. The Planck length, many orders of magnitude smaller than an atom, is proposed as the smallest measurable unit possible in the universe, coastlines differ from mathematical fractals because they are formed by numerous small events, which create patterns only statistically. In reality, permanent features of the coastline of order of size 1 cm or less do not exist, because of erosion, in most places the minimum size is much larger than this. Thus the concept of a fractal is not applicable to the coastline. For practical considerations, a choice of minimum feature size is on the order of the units being used to measure. If a coastline is measured in kilometers, then small variations much smaller than one kilometer are easily ignored, to measure the coastline in centimeters, tiny variations the size of centimeters must be considered. Using different measurement methodologies for different units also destroys the usual certainty that units can be converted by a simple multiplication, extreme cases of the coastline paradox include the fjord-heavy coastlines of Norway, Chile and the Pacific Northwest of North America. Coastline problem Fractal dimension Gabriels Horn, a figure with infinite surface area. Post, David G. and Michael Eisen, how Long is the Coastline of Law. Thoughts on the Fractal Nature of Legal Systems, journal of Legal Studies XXIX, January 2000
10.
West Coast of the United States
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The West Coast or Pacific Coast is the coastline along which the contiguous Western United States meets the North Pacific Ocean. As a region, this term most often refers to the states of California. More specifically, it refers to an area defined on the east by the Cascade Range, Sierra Nevada and Mojave Desert, the U. S. Census groups the five states of California, Oregon, Washington, Alaska, and Hawaii together as the Pacific States division. As of the 2010 Census, the population of the Census Bureaus Pacific Region was approximately 47.8 million – about 15. 3% of US population. The largest city on the west coast of the United States is Los Angeles, small isolated groups of hunter-gatherers migrated alongside herds of large herbivores far into Alaska. Between 16,500 BCE and 13,500 BCE, ice-free corridors developed along the Pacific coast and valleys of North America, Alaska Natives, indigenous peoples of the Pacific Northwest Coast, and California indigenous peoples eventually descended from the Paleo-Indians. They developed various languages and established trade routes, later, Spanish, British, French, Russian, and American explorers and settlers began colonizing the area. The West Coast of the United States has a climate in its Northern edge towards the Canada–US border. The coastline sees significantly mild temperatures when compared to the areas during summer. In far Northern California there is a difference of 17 °C between Eurekas and Willow Creek in spite of only 25 miles separating the locations and Willow Creek being located at a 500 metres elevation, coastal fog is also prevalent in keeping shoreline temperatures cool. Since the West Coast has been populated by more recently than the East Coast. Additionally, its demographic composition underlies its cultural difference from the rest of the United States. Californias history first as a major Spanish colony, and later Mexican territory, has given the lower West Coast a distinctive Hispanic tone, which it also shares with the rest of the Southwest. Similarly, two of the three cities in which Asian Americans have concentrated, San Francisco and Los Angeles, are located on the West Coast, San Franciscos Chinatown, the oldest in North America, is a vibrant cultural center. The West Coast also has a large share of green cities within the United States. Other writers, like Jean Baudrillard, Mike Davis, and Umberto Eco, have made related statements on Californian culture, in the Northwest, Portland and Seattle are both considered among the coffee capitals of the world. While Starbucks originated in Seattle, both towns are known for coffee roasters and independent coffeeshops. In the Pacific Northwest at large, which includes the Canadian west coast, the culture has significantly shaped by the environment, especially by its forests, mountains
11.
Pelagic zone
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Any water in a sea or lake that is neither close to the bottom nor near the shore can be said to be in the pelagic zone. The word pelagic is derived from Greek πέλαγος, meaning open sea, the pelagic zone can be thought of in terms of an imaginary cylinder or water column that goes from the surface of the sea almost to the bottom. Conditions differ deeper in the water such that as pressure increases with depth. Depending on the depth, the column, rather like the Earths atmosphere. The pelagic zone occupies 1,330 million km3 with a depth of 3.68 km. Pelagic life decreases with increasing depth and it is affected by light intensity, pressure, temperature, salinity, the supply of dissolved oxygen and nutrients, and the submarine topography, which is called bathymetry. In deep water, the zone is sometimes called the open-ocean zone. In other contexts, coastal water not near the bottom is still said to be in the pelagic zone, the pelagic zone can be contrasted with the benthic and demersal zones at the bottom of the sea. The benthic zone is the region at the very bottom of the sea. It includes the sediment surface and some subsurface layers, Marine organisms living in this zone, such as clams and crabs, are called benthos. The demersal zone is just above the benthic zone and it can be significantly affected by the seabed and the life that lives there. Demersal fish are known as bottom feeders and groundfish. Depending on how deep the sea is, the zone can extend over up to five horizontal layers in the ocean. From the top down, these are, From the surface down to around 200 m This is the zone at the surface of the sea where enough light is available for photosynthesis. Nearly all primary production in the ocean occurs here, consequently, plants and animals are largely concentrated in this zone. Examples of organisms living in this zone are plankton, floating seaweed, jellyfish, tuna, many sharks, from 200 m down to around 1,000 m The name for this zone stems from Greek μέσον, meaning middle. Although some light penetrates this second layer it is insufficient for photosynthesis, at about 500 m the water also becomes depleted of oxygen. Organisms survive this environment by having more efficient gills or by minimizing movement, examples of animals that live here are swordfish, squid, Anarhichadidae or wolffish and some species of cuttlefish
12.
Bay
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A bay is a recessed, coastal body of water that directly connects to a larger main body of water, such as an ocean, lake, or another bay. A large bay may be called a gulf, sea, sound, a cove is a type of smaller bay with a circular inlet and narrow entrance. A fjord is a particularly steep bay shaped by glacial activity, bays can be the estuary of a river, such as the Chesapeake Bay, an estuary of the Susquehanna River, which is the largest bay in North America. Bays may also be nested within each other, for example, some large bays, such as the Bay of Bengal and the Hudson Bay, have varied marine geology. The land surrounding a bay often reduces the strength of winds, bays were significant in the history of human settlement because they provided a safe place for fishing. Later they were important in the development of sea trade as the safe anchorage they provide encouraged their selection as ports, there are various ways from which bays can be created. The largest bays have developed as a result of plate tectonics, as the super-continent Pangaea broke up along curved and indented fault lines, the continents moved apart and the worlds largest bays formed. These include the Gulf of Guinea, Gulf of Mexico and the Bay of Bengal, another way bays form is via glacial and river erosion. A bay formed by a glacier is a fjord, rias are created by rivers and are characterised by more gradual slopes. Currents can make waves more constant, and soft rocks speed erosion, hard rock eroded less quickly, leaving headlands. The Gulf of California is an example of a bay created by plate tectonics as Baja California peninsula moves away from the Mexican mainland, Bay platform Great capes Headlands and bays
13.
Body of water
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A body of water or waterbody is any significant accumulation of water, generally on a planets surface. The term most often refers to oceans, seas, and lakes, a body of water does not have to be still or contained, Rivers, streams, canals, and other geographical features where water moves from one place to another are also considered bodies of water. Most are naturally occurring geographical features, but some are artificial, there are types that can be either. For example, most reservoirs are created by engineering dams, similarly, most harbors are naturally occurring bays, but some harbors have been created through construction. Bodies of water that are navigable are known as waterways, some bodies of water collect and move water, such as rivers and streams, and others primarily hold water, such as lakes and oceans. The term body of water can also refer to a reservoir of water held by a plant, note that there are some geographical features involving water that are not bodies of water, for example waterfalls, geysers and rapids. Arm of the sea - also sea arm, used to describe a sea loch, arroyo - a usually dry creek bed or gulch that temporarily fills with water after a heavy rain, or seasonally. Artificial lake or artificial pond - see reservoir or impoundment, barachois - a lagoon separated from the ocean by a sand bar. Bay - an area of water bordered by land on three sides, similar to, but smaller than a gulf, bayou - a slow-moving stream or a marshy lake. Bight - a large and often only slightly receding bay, or a bend in any geographical feature, billabong - see Oxbow lake, a pond or still body of water created when a river changes course and some water becomes trapped. Boil - see Seep Brook - a small stream, canal - an artificial waterway, usually connected to existing lakes, rivers, or oceans. Channel - the physical confine of a river, slough or ocean consisting of a bed. See also stream bed and strait, earth scientists generally use the term to describe a circular or round inlet with a narrow entrance, though colloquially the term is sometimes used to describe any sheltered bay. Basin - a region of land where water from rain or snowmelt drains downhill into another body of water, such as a river, lake, creek - an inlet of the sea, narrower than a cove. Delta - the location where a river flows into an ocean, sea, estuary, lake, distributary or distributary channel - a stream that branches off and flows away from a main stream channel. Draw - a usually dry creek bed or gulch that temporarily fills with water after a heavy rain, fjord - a submergent landform which has occurred due to glacial activity. Glacier - a large collection of ice or a river that moves slowly down a mountain. Glacial Pothole - see Kettle Gulf - a part of a lake or ocean that extends so that it is surrounded by land on three sides, similar to, but larger than a bay, headland - an area of water bordered by land on three sides
14.
River
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A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases a river flows into the ground and becomes dry at the end of its course without reaching another body of water, small rivers can be referred to using names such as stream, creek, brook, rivulet, and rill. There are no official definitions for the term river as applied to geographic features. Many names for small rivers are specific to geographic location, examples are run in parts of the United States, burn in Scotland and northeast England. Sometimes a river is defined as being larger than a creek, but not always, Rivers are part of the hydrological cycle. Potamology is the study of rivers while limnology is the study of inland waters in general. Extraterrestrial rivers of liquid hydrocarbons have recently found on Titan. Channels may indicate past rivers on other planets, specifically outflow channels on Mars and rivers are theorised to exist on planets, a river begins at a source, follows a path called a course, and ends at a mouth or mouths. The water in a river is confined to a channel. In larger rivers there is also a wider floodplain shaped by flood-waters over-topping the channel. Floodplains may be wide in relation to the size of the river channel. This distinction between river channel and floodplain can be blurred, especially in areas where the floodplain of a river channel can become greatly developed by housing. Rivers can flow down mountains, through valleys or along plains, the term upriver refers to the direction towards the source of the river, i. e. against the direction of flow. Likewise, the term describes the direction towards the mouth of the river. The term left bank refers to the bank in the direction of flow. The river channel typically contains a stream of water, but some rivers flow as several interconnecting streams of water. Extensive braided rivers are now found in only a few regions worldwide and they also occur on peneplains and some of the larger river deltas. Anastamosing rivers are similar to braided rivers and are quite rare
15.
Pond
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A pond is a body of standing water, either natural or artificial, that is usually smaller than a lake. They may arise naturally in floodplains as part of a river system, usually they contain shallow water with marsh and aquatic plants and animals. In the countryside farmers and villagers dig a pond in their backyard or increase the depth of a pond by removing layers of mud during summer season. A wide variety of bodies of water are classified as ponds. Some ponds are created specifically for restoration, including water treatment. Others, like gardens, water features and koi ponds are designed for aesthetic ornamentation as landscape or architectural features. Fish ponds are designed for commercial breeding, and solar ponds designed to store thermal energy. Standing bodies of such as puddles, ponds, and lakes are often categorized separately from flowing water courses, such as brooks, creeks. Nutrient levels and water quality in ponds can be controlled through natural process such as growth, or through artificial filtration. The technical distinction between a pond and a lake has not been universally standardized, each of these definitions has met with resistance or disapproval, as the defining characteristics are each difficult to measure or verify. Accordingly, some organizations and researchers have settled on technical definitions of pond, even among organizations and researchers who distinguish lakes from ponds by size alone, there is no universally recognised standard for the maximum size of a pond. The international Ramsar wetland convention sets the limit for pond size as 8 hectares. Other European biologists have set the size limit at 5 ha. In practice, a body of water is called a pond or a lake on a basis, as conventions change from place to place. There are numerous examples in other states of bodies of water less than 10 acres being called lakes, as the case with Crystal Lake shows, marketing purposes may be the driving factor behind some names. Ponds can result from a range of natural processes. Rivers often leave behind ponds in natural flood plains after spring flooding, retreating glaciers can leave behind landscapes filled with small depressions, each developing its own pond, an example is the Prairie Pothole Region of North America. Some ponds are created by animals, beaver ponds are the best known example, but alligators also excavate ponds as well
16.
Levee
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A levee, dike, dyke, embankment, floodbank or stopbank is an elongated naturally occurring ridge or artificially constructed fill or wall, which regulates water levels. It is usually earthen and often parallel to the course of a river in its floodplain or along low-lying coastlines, the word levee, from the French word levée, is used in American English. It originated in New Orleans a few years after the founding in 1718 and was later adopted by English speakers. The name derives from the trait of the ridges being raised higher than both the channel and the surrounding floodplains. The modern word dike or dyke most likely derives from the Dutch word dijk, the 126 kilometres long Westfriese Omringdijk was completed by 1250, and was formed by connecting existing older dikes. The Roman chronicler Tacitus even mentions that the rebellious Batavi pierced dikes to flood their land, the word dijk originally indicated both the trench and the bank. It is closely related to the English verb to dig, in Anglo-Saxon, the word dic already existed and was pronounced as dick in northern England and as ditch in the south. Similar to Dutch, the English origins of the lie in digging a trench. This practice has meant that the name may be given to either the excavation or the bank, thus Offas Dyke is a combined structure and Car Dyke is a trench though it once had raised banks as well. In the midlands and north of England, and in the United States, a dike is what a ditch is in the south, a property boundary marker or small drainage channel. Where it carries a stream, it may be called a dike as in Rippingale Running Dike. The Weir Dike is a dike in Bourne North Fen, near Twenty and alongside the River Glen. In the Norfolk and Suffolk Broads, a dyke may be a ditch or a narrow artificial channel off a river or broad for access or mooring, some longer dykes being named. In parts of Britain, particularly Scotland, a dyke may be a field wall, Levees can be mainly found along the sea, where dunes are not strong enough, along rivers for protection against high-floods, along lakes or along polders. Furthermore, levees have been built for the purpose of empoldering, the latter can be a controlled inundation by the military or a measure to prevent inundation of a larger area surrounded by levees. Levees have also built as field boundaries and as military defences. More on this type of levee can be found in the article on dry-stone walls, Levees can be permanent earthworks or emergency constructions built hastily in a flood emergency. When such a bank is added on top of an existing levee it is known as a cradge
17.
Jurisdiction
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Jurisdiction is the practical authority granted to a legal body to administer justice within a defined area of responsibility, e. g. Michigan tax law. In federations like the U. S. areas of jurisdiction apply to local, state, colloquially it is used to refer to the geographical area to which such authority applies, e. g. the court has jurisdiction over all of Colorado. The legal term refers only to the authority, not to a geographical area. International laws and treaties provide agreements which nations agree to be bound to, supranational organizations provide mechanisms whereby disputes between nations may be resolved through arbitration or mediation. When a country is recognized as de jure, it is an acknowledgment by the de jure nations that the country has sovereignty. However, it is often at the discretion of each nation whether to co-operate or participate, if a nation does agree to participate in activities of the supranational bodies and accept decisions, the nation is giving up its sovereign authority and thereby allocating power to these bodies. The fact that organizations, courts and tribunals have been created raises the difficult question of how to co-ordinate their activities with those of national courts. But, to invoke the jurisdiction in any case, all the parties have to accept the prospective judgment as binding. This reduces the risk of wasting the Courts time, each such group may form transnational institutions with declared legislative or judicial powers. For example, in Europe, the European Court of Justice has been given jurisdiction as the appellate court to the member states on issues of European law. This jurisdiction is entrenched and its authority could only be denied by a member if that member nation asserts its sovereignty. Hence, in the Netherlands, all treaties and the orders of international organizations are effective without any action being required to convert international into municipal law, in nations adopting this theory, the local courts automatically accept jurisdiction to adjudicate on lawsuits relying on international law principles. Otherwise the courts have a discretion to apply international law where it does not conflict with statute or the common law. According to the Supreme Court of the United States, the treaty power authorizes Congress to legislate under the Necessary and this concerns the relationships both between courts in different jurisdictions, and between courts within the same jurisdiction. The usual legal doctrine under which questions of jurisdiction are decided is termed forum non conveniens, to deal with the issue of forum shopping, nations are urged to adopt more positive rules on conflict of laws. In addition, the Lugano Convention binds the European Union and the European Free Trade Association, council Regulation 44/2001 now also applies as between the rest of the EU Member States and Denmark due to an agreement reached between the European Community and Denmark. In some legal areas, at least, the CACA enforcement of judgments is now more straightforward. At a national level, the rules still determine jurisdiction over persons who are not domiciled or habitually resident in the European Union or the Lugano area
18.
Tide
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Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth. Some shorelines experience a semi-diurnal tide—two nearly equal high and low tides each day, other locations experience a diurnal tide—only one high and low tide each day. A mixed tide—two uneven tides a day, or one high, Tides vary on timescales ranging from hours to years due to a number of factors. To make accurate records, tide gauges at fixed stations measure water level over time, gauges ignore variations caused by waves with periods shorter than minutes. These data are compared to the level usually called mean sea level. Tidal phenomena are not limited to the oceans, but can occur in other systems whenever a gravitational field varies in time. For example, the part of the Earth is affected by tides. Tide changes proceed via the following stages, Sea level rises over several hours, covering the intertidal zone, the water rises to its highest level, reaching high tide. Sea level falls over several hours, revealing the intertidal zone, the water stops falling, reaching low tide. Oscillating currents produced by tides are known as tidal streams, the moment that the tidal current ceases is called slack water or slack tide. The tide then reverses direction and is said to be turning, slack water usually occurs near high water and low water. But there are locations where the moments of slack tide differ significantly from those of high, Tides are commonly semi-diurnal, or diurnal. The two high waters on a day are typically not the same height, these are the higher high water. Similarly, the two low waters each day are the low water and the lower low water. The daily inequality is not consistent and is small when the Moon is over the equator. From the highest level to the lowest, Highest Astronomical Tide – The highest tide which can be predicted to occur, note that meteorological conditions may add extra height to the HAT. Mean High Water Springs – The average of the two high tides on the days of spring tides, mean High Water Neaps – The average of the two high tides on the days of neap tides. Mean Sea Level – This is the sea level
19.
Sediment
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For sediment in beverages, see dregs. For example, sand and silt can be carried in suspension in water and on reaching the sea be deposited by sedimentation. Sediments are most often transported by water, but also wind, beach sands and river channel deposits are examples of fluvial transport and deposition, though sediment also often settles out of slow-moving or standing water in lakes and oceans. Desert sand dunes and loess are examples of transport and deposition. Glacial moraine deposits and till are ice-transported sediments, sediment can be classified based on its grain size and/or its composition. Sediment size is measured on a log base 2 scale, called the Phi scale, composition of sediment can be measured in terms of, parent rock lithology mineral composition chemical make-up. This leads to an ambiguity in which clay can be used as both a size-range and a composition, sediment is transported based on the strength of the flow that carries it and its own size, volume, density, and shape. Stronger flows will increase the lift and drag on the particle, causing it to rise, rivers and streams carry sediment in their flows. This sediment can be in a variety of locations within the flow and these relationships are shown in the following table for the Rouse number, which is a ratio of sediment fall velocity to upwards velocity. If the upwards velocity is less than the settling velocity, but still high enough for the sediment to move, it will move along the bed as bed load by rolling, sliding. If the upwards velocity is higher than the velocity, the sediment will be transported high in the flow as wash load. As there are generally a range of different particle sizes in the flow, sediment motion can create self-organized structures such as ripples, dunes, antidunes on the river or stream bed. These bedforms are often preserved in rocks and can be used to estimate the direction. Overland flow can erode soil particles and transport them downslope, the erosion associated with overland flow may occur through different methods depending on meteorological and flow conditions. If the initial impact of rain droplets dislodges soil, the phenomenon is called rainsplash erosion, if overland flow is directly responsible for sediment entrainment but does not form gullies, it is called sheet erosion. If the flow and the substrate permit channelization, gullies may form, glaciers carry a wide range of sediment sizes, and deposit it in moraines. The overall balance between sediment in transport and sediment being deposited on the bed is given by the Exner equation and this expression states that the rate of increase in bed elevation due to deposition is proportional to the amount of sediment that falls out of the flow. This can be localized, and simply due to obstacles, examples are scour holes behind boulders, where flow accelerates
20.
Tidal bore
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Bores occur in relatively few locations worldwide, usually in areas with a large tidal range and where incoming tides are funneled into a shallow, narrowing river or lake via a broad bay. The funnel-like shape not only increases the range, but it can also decrease the duration of the flood tide. A tidal bore takes place during the tide and never during the ebb tide. Large bores can be unsafe for shipping but also present opportunities for river surfing. Two key features of a tidal bore are the intense turbulence and turbulent mixing generated during the bore propagation, the visual observations of tidal bores highlight the turbulent nature of the surging waters. The tidal bore induces a strong turbulent mixing in the zone. The velocity observations indicate a deceleration of the flow associated with the passage of the bore as well as large velocity fluctuations. The bore rumble is heard far away because its low frequencies can travel long distances. The word bore derives through Old English from the Old Norse word bára, the tidal bores may be dangerous and many bores have had a sinister reputation, the River Seine, the Petitcodiac River, and the Colorado River, to name a few. In China, despite warning signs erected along the banks of the Qiantang River, the tidal bores affect the shipping and navigation in the estuarine zone, for example, in Papua New Guinea, Malaysia, and India. On the other hand, tidal bore-affected estuaries are rich feeding zones, the tidal bores also provide opportunity for recreational inland surfing. Scientific studies have been carried out at the River Dee in the United Kingdom, the Garonne and Sélune rivers in France, and the Daly River in Australia. The force of the tidal flow often poses a challenge to scientific measurements, as evidenced by a number of field work incidents in the River Dee, Rio Mearim, Daly River. Rivers and bays that have known to exhibit bores include those listed below. The tidal bore is known as benak. Bono, Kampar River, at Meranti Bay, Pelalawan, Indonesia, the phenomenon is feared by the locals to sink ships. It is reported to break up to 130 kilometers inland, the second highest tidal bore after the Severn bore, up to 1.7 meters high. The bore tends to form around the Manchester Ship Canal, the Severn bore on the River Severn, Wales and England, up to 2 meters high The Trent Aegir on the River Trent, England, up to 1.5 meters high
21.
Estuary
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An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries form a zone between river environments and maritime environments. They are subject both to marine influences—such as tides, waves, and the influx of saline water—and to riverine influences—such as flows of fresh water and sediment. The inflows of sea water and fresh water provide high levels of nutrients both in the water column and in sediment, making estuaries among the most productive natural habitats in the world. Most existing estuaries formed during the Holocene epoch with the flooding of river-eroded or glacially scoured valleys when the sea began to rise about 10. Estuaries are typically classified according to their geomorphological features or to water-circulation patterns, the banks of many estuaries are amongst the most heavily populated areas of the world, with about 60% of the worlds population living along estuaries and the coast. The word estuary is derived from the Latin word aestuarium meaning tidal inlet of the sea, there have been many definitions proposed to describe an estuary. However, this definition excludes a number of water bodies such as coastal lagoons. This broad definition also includes fjords, lagoons, river mouths, an estuary is a dynamic ecosystem having a connection to the open sea through which the sea water enters with the rhythm of the tides. The sea water entering the estuary is diluted by the water flowing from rivers. The pattern of dilution varies between different estuaries and depends on the volume of water, the tidal range. Drowned river valleys are known as coastal plain estuaries. In places where the sea level is rising relative to the land, sea water progressively penetrates into river valleys and this is the most common type of estuary in temperate climates. Well-studied estuaries include the Severn Estuary in the United Kingdom and the Ems Dollard along the Dutch-German border, the width-to-depth ratio of these estuaries is typically large, appearing wedge-shaped in the inner part and broadening and deepening seaward. Water depths rarely exceed 30 m, examples of this type of estuary in the U. S. are the Hudson River, Chesapeake Bay, and Delaware Bay along the Mid-Atlantic coast, and Galveston Bay and Tampa Bay along the Gulf Coast. They are relatively common in tropical and subtropical locations and these estuaries are semi-isolated from ocean waters by barrier beaches. Formation of barrier beaches partially encloses the estuary, with only narrow inlets allowing contact with the ocean waters, bar-built estuaries typically develop on gently sloping plains located along tectonically stable edges of continents and marginal sea coasts. They are extensive along the Atlantic and Gulf coasts of the U. S. in areas with active coastal deposition of sediments, barrier beaches form in shallow water and are generally parallel to the shoreline, resulting in long, narrow estuaries
22.
Cliffed coast
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A cliffed coast, also called an abrasion coast, is a form of coast where the action of marine waves has formed steep cliffs that may or may not be precipitous. It contrasts with a flat or alluvial coast, the slope is constantly being eroded. The waves attacking the cliff-foot form a notch by constant abrasion action producing an overhang. This overhang grows in size as the cliff is undercut, until it collapses under its own weight, the loose debris that has broken off is gradually carried away from the area in front of the cliff by the action of the sea. As the coastal cliffs collapse, the shoreline recedes inland, the speed at which this happens depends, in particular, on the strength of the surf, the height of the cliff, the frequency of storm surges and the hardness of the bedrock. Thus, the Mecklenburg coast in Germany recedes by about 25 centimetres per year, whereas the chalk cliffs of southern England retreat by just ½ a centimetre each year. A cliffed coast is made of a loose material, such as at the Red Cliff on the German island of Sylt. There are, however, differences between the former and the latter regarding some peculiarities of the coast line and it represents the foot of the cliff preserved at and below the level of water table. On a cliffed coast made up of material which is only fairly or even hardly resistant to erosion no wave-cut platform, if waves carve notches at a narrow point on both sides of a promontory on the rocky cliffed coast, a natural arch may be formed. When the arch collapses as the coastline recedes further a stack is left behind on the wave-cut platform, the best-known example in Germany is the Lange Anna on Heligoland. Furthermore, on a rocky cliffed coast wave action is not the driving force for coastline retreat. General weathering of the bedrock is almost equally important, living cliffs are those on a coast that is still active, i. e. that is being eroded and is receding. A dead cliff, by contrast, is reached by very high marine waves and is therefore subjected to very little change. A clear indication of a lack of activity at a cliff is a covering of vegetation that appears on the cliff as wave action against it subsides. Well-known coasts with living cliffs in Germany are the Red Cliff in Kampen on the island of Sylt or the cliffs on the Jasmund Peninsula. The Königsstuhl on the island of Rügen is an example of a dead cliff. Others may be found in the regions of the present-day Wadden Sea coast of the North Sea a few kilometres inland and these show the former coastline from which the sea retreated as the level of water in the North Sea fell. Steep sea cliffs can also be caused by catastrophic debris avalanches and these have been common on the submerged flanks of ocean island volcanos such as the Hawaiian Islands and the Cape Verde Islands
23.
Sea level rise
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Sea level rise refers to an increase in the volume of water in the world’s oceans, resulting in an increase in global mean sea level. Sea level rise is attributed to global climate change by thermal expansion of the water in the oceans and by melting of Ice sheets. Melting of floating ice shelves or icebergs at sea raises sea levels only slightly, Sea level rise at specific locations may be more or less than the global average. Local factors might include tectonic effects, subsidence of the land, tides, currents, storms, Sea level rise is expected to continue for centuries. IPCC Summary for Policymakers, AR5,2014, indicated that the mean sea level rise will continue during the 21st century, very likely at a faster rate than observed from 1971 to 2010. A January 2017 NOAA report suggests a range of GMSL rise of 0.3 –2.5 m possible during the 21st century, Sea level rises can considerably influence human populations in coastal and island regions and natural environments like marine ecosystems. On the timescale of centuries to millennia, the melting of ice sheets could result in even higher sea level rise, partial deglaciation of the Greenland ice sheet, and possibly the West Antarctic ice sheet, could contribute 4 to 6 m or more to sea level rise. Various factors affect the volume or mass of the ocean, leading to changes in eustatic sea level. The two primary influences are temperature, and the mass of water locked up on land and sea as water in rivers, lakes, glaciers. Over much longer timescales, changes in the shape of oceanic basins. Since the Last Glacial Maximum about 20,000 years ago, sea level has risen by more than 125 m, with rates varying from tenths of a mm/yr to 10+mm/year, as a result of melting of major ice sheets. During the rest of the early Holocene, the rate of sea level rise varied from a low of about 6.0 -9.9 mm/yr to as high as 30 -60 mm/yr during brief periods of accelerated sea level rise. In sharp contrast, the period between 14,300 and 11,100 calendar years ago, which includes the Younger Dryas interval, was an interval of reduced sea level rise at about 6.0 -9.9 mm/yr. Meltwater pulse 1C was centered at 8,000 calendar years, such rapid rates of sea level rising during meltwater events clearly implicate major ice-loss events related to ice sheet collapse. The primary source may have been meltwater from the Antarctic ice sheet, other studies suggest a Northern Hemisphere source for the meltwater in the Laurentide ice sheet. For example, this research included studies of Roman wells in Caesarea and these methods in combination suggest a mean eustatic component of 0.07 mm/yr for the last 2000 years. Since 1880, as the Industrial Revolution took center stage, the ocean began to rise briskly, climbing a total of 210 mm through 2009 causing extensive erosion worldwide, Sea level rose by 6 cm during the 19th century and 19 cm in the 20th century. Evidence for this includes geological observations, the longest instrumental records, for example, geological observations indicate that during the last 2,000 years, sea level change was small, with an average rate of only 0. 0–0.2 mm per year
24.
Weather
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Weather is the state of the atmosphere, to the degree that it is hot or cold, wet or dry, calm or stormy, clear or cloudy. Most weather phenomena occur in the lowest level of the atmosphere, Weather refers to day-to-day temperature and precipitation activity, whereas climate is the term for the averaging of atmospheric conditions over longer periods of time. When used without qualification, weather is understood to mean the weather of Earth. Weather is driven by air pressure, temperature and moisture differences between one place and another and these differences can occur due to the suns angle at any particular spot, which varies with latitude. The strong temperature contrast between polar and tropical air gives rise to the largest scale atmospheric circulations, the Hadley Cell, the Ferrel Cell, the Polar Cell, Weather systems in the mid-latitudes, such as extratropical cyclones, are caused by instabilities of the jet stream flow. Because the Earths axis is tilted relative to its orbital plane, on Earths surface, temperatures usually range ±40 °C annually. Over thousands of years, changes in Earths orbit can affect the amount and distribution of energy received by the Earth, thus influencing long-term climate. Surface temperature differences in turn cause pressure differences, higher altitudes are cooler than lower altitudes as most atmospheric heating is due to contact with the Earths surface while radiative losses to space are mostly constant. Weather forecasting is the application of science and technology to predict the state of the atmosphere for a future time and a given location. The Earths weather system is a system, as a result. Human attempts to control the weather have occurred throughout history, and there is evidence that human activities such as agriculture, studying how the weather works on other planets has been helpful in understanding how weather works on Earth. A famous landmark in the Solar System, Jupiters Great Red Spot, is a storm known to have existed for at least 300 years. However, weather is not limited to planetary bodies, a stars corona is constantly being lost to space, creating what is essentially a very thin atmosphere throughout the Solar System. The movement of mass ejected from the Sun is known as the solar wind, on Earth, the common weather phenomena include wind, cloud, rain, snow, fog and dust storms. Less common events include natural disasters such as tornadoes, hurricanes, typhoons, almost all familiar weather phenomena occur in the troposphere. Weather does occur in the stratosphere and can affect weather lower down in the troposphere, Weather occurs primarily due to air pressure, temperature and moisture differences between one place to another. These differences can occur due to the sun angle at any particular spot, in other words, the farther from the tropics one lies, the lower the sun angle is, which causes those locations to be cooler due the spread of the sunlight over a greater surface. The strong temperature contrast between polar and tropical air gives rise to the large scale atmospheric circulation cells and the jet stream, Weather systems in the mid-latitudes, such as extratropical cyclones, are caused by instabilities of the jet stream flow
25.
Erosion
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In earth science, erosion is the action of surface processes that remove soil, rock, or dissolved material from one location on the Earths crust, then transport it away to another location. Eroded sediment or solutes may be transported just a few millimetres, the rates at which such processes act control how fast a surface is eroded. Feedbacks are also possible between rates of erosion and the amount of eroded material that is carried by, for example. Processes of erosion that produce sediment or solutes from a place contrast with those of deposition, while erosion is a natural process, human activities have increased by 10-40 times the rate at which erosion is occurring globally. At well-known agriculture sites such as the Appalachian Mountains, intensive farming practices have caused erosion up to 100x the speed of the rate of erosion in the region. Excessive erosion causes both on-site and off-site problems, on-site impacts include decreases in agricultural productivity and ecological collapse, both because of loss of the nutrient-rich upper soil layers. In some cases, the end result is desertification. Off-site effects include sedimentation of waterways and eutrophication of bodies, as well as sediment-related damage to roads. Intensive agriculture, deforestation, roads, anthropogenic climate change and urban sprawl are amongst the most significant human activities in regard to their effect on stimulating erosion, however, there are many prevention and remediation practices that can curtail or limit erosion of vulnerable soils. Rainfall, and the surface runoff which may result from rainfall, produces four types of soil erosion, splash erosion, sheet erosion, rill erosion. Splash erosion is generally seen as the first and least severe stage in the erosion process. In splash erosion, the impact of a falling raindrop creates a crater in the soil. The distance these soil particles travel can be as much as 0.6 m vertically and 1.5 m horizontally on level ground. If the soil is saturated, or if the rate is greater than the rate at which water can infiltrate into the soil. If the runoff has sufficient flow energy, it will transport loosened soil particles down the slope, sheet erosion is the transport of loosened soil particles by overland flow. Rill erosion refers to the development of small, ephemeral concentrated flow paths which function as both sediment source and sediment delivery systems for erosion on hillslopes, generally, where water erosion rates on disturbed upland areas are greatest, rills are active. Flow depths in rills are typically of the order of a few centimetres or less and this means that rills exhibit hydraulic physics very different from water flowing through the deeper, wider channels of streams and rivers. Gully erosion occurs when water accumulates and rapidly flows in narrow channels during or immediately after heavy rains or melting snow
26.
Accretion (geology)
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Accretion is a process by which material is added to a tectonic plate or a landmass. This material may be sediment, volcanic arcs, seamounts or other igneous features, accretion involves the addition of material to a tectonic plate. When two tectonic plates collide, one of the plates may slide under the other, a known as subduction. The plate which is being subducted, is floating on the asthenosphere and is pushed against the other, sediment on the ocean floor will often be scraped from the subducting plate. This causes the sediment to accumulate as a mass of material called an accretionary wedge, volcanic island arcs or seamounts may collide with the continent, and as they are of relatively light material they will often not be subducted, but are added to the side of the continent. Continental plates are formed of rocks that are noticeably different from the rocks that form the ocean floor. The ocean floor is composed of basaltic rocks which have a higher density than continental plates. In places where plate accretion has occurred, land masses may contain the dense and this process occurs wherever plates collide. Many examples occur around the Pacific Rim, including the western coast of North America, the Nankai accretionary complex of Japan, the Barbados Ridge in the Caribbean, the Mediterranean Ridge and the Franciscan Assemblage of California are examples. New York, Lee & Shepard,1995
27.
Continental shelf
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The continental shelf is an underwater landmass which extends from a continent, resulting in an area of relatively shallow water known as a shelf sea. Much of the shelves were exposed during glacial periods and interglacial periods, the shelf surrounding an island is known as an insular shelf. The continental margin, between the shelf and the abyssal plain, comprises a steep continental slope followed by the flatter continental rise. Sediment from the continent above cascades down the slope and accumulates as a pile of sediment at the base of the slope, extending as far as 500 km from the slope, it consists of thick sediments deposited by turbidity currents from the shelf and slope. The continental rises gradient is intermediate between the slope and the shelf, on the order of 0. 5–1°, the largest shelf – the Siberian Shelf in the Arctic Ocean – stretches to 1,500 kilometers in width. The South China Sea lies over another extensive area of shelf, the Sunda Shelf, which joins Borneo, Sumatra. Other familiar bodies of water that overlie continental shelves are the North Sea, the average width of continental shelves is about 80 km. The depth of the shelf also varies, but is limited to water shallower than 150 m. The slope of the shelf is quite low, on the order of 0. 5°, vertical relief is also minimal. Though the continental shelf is treated as a province of the ocean, it is not part of the deep ocean basin proper. Passive continental margins such as most of the Atlantic coasts have wide and shallow shelves, active continental margins have narrow, relatively steep shelves, due to frequent earthquakes that move sediment to the deep sea. The shelf usually ends at a point of increasing slope, the sea floor below the break is the continental slope. Below the slope is the rise, which finally merges into the deep ocean floor. The continental shelf and the slope are part of the continental margin, the shelf area is commonly subdivided into the inner continental shelf, mid continental shelf, and outer continental shelf, each with their specific geomorphology and marine biology. The character of the shelf changes dramatically at the shelf break, with a few exceptions, the shelf break is located at a remarkably uniform depth of roughly 140 m, this is likely a hallmark of past ice ages, when sea level was lower than it is now. The continental slope is steeper than the shelf, the average angle is 3°. The slope is cut with submarine canyons. The physical mechanisms involved in forming these canyons were not well understood until the 1960s, the continental shelves are covered by terrigenous sediments, that is, those derived from erosion of the continents
28.
Ria
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A ria is a coastal inlet formed by the partial submergence of an unglaciated river valley. It is a river valley that remains open to the sea. Typically, rias have a dendritic, treelike outline although they can be straight and this pattern is inherited from the dendritic drainage pattern of the flooded river valley. The drowning of river valleys along a stretch of coast and formation of rias results in an extremely irregular, often, there are islands, which are summits of partly submerged, pre-existing hill peaks. A ria coast is a coastline having several parallel rias separated by prominent ridges, the sea level change that caused the submergence of a river valley may be either eustatic, or isostatic. The result is often a large estuary at the mouth of a relatively insignificant river. The word ria comes from Portuguese ria or Galician ría, which is related to Spanish and Galician río, Rias are present all along the Galician coast in Spain. As originally defined, the term was restricted to drowned river valleys cut parallel to the structure of the rock that was at right angles to the coastline. However, the definition of ria was later expanded to other flooded river valleys regardless of the structure of the country rock, for a period of time, European geomorphologists regarded rias to include any broad estuarine river mouth, including fjords. These are long, narrow inlets with steep sides or cliffs, in the 21st century, however, the preferred usage of ria by geologists and geomorphologists is to refer solely to drowned unglaciated river valleys. It therefore excludes fjords by definition, since fjords are products of glaciation, portugal, the country has no rias as such, the Ria de Aveiro in Aveiro, and Ria Formosa in Eastern Algarve are actually lagoons. Atlantic coast of Spain Galicia, The Rias Baixas, like the Ria of Vigo, Ria of Pontevedra, Ria de Arousa, Ria of Muros and Noia, Ria of Corcubion, Cee and Ria de Aldán. The Rias Altas like the Ria of Corunna, Ria of Ares and Betanzos, Ria of Cedeira, Ria of O Barqueiro, Ria of Ferrol, Ria of Ortigueira, Ria of Viveiro, Ria of Foz and Ria of Ribadeo. Asturias, Ria of Avilés, Ria of Ribadeo, Ria of Navia, Ria of Villaviciosa, Ria of Ribadesella, Ria of Llanes, basque Country, Ria of Bilbao, mouth of the rivers Nervión, Ibaizabal, and Cadagua. Andalusia, Ria of Carreras, Ria of Huelva at the mouth of the rivers Odiel, Brittany, The rias in northern Brittany are called Abers, Aber Wrach, Aber Benoît, Aber Ildut. Ireland, Lough Swilly located on the tip of Ireland on the Inishowen peninsula region is an example of an Irish ria. Wales, Milford Haven in Pembrokeshire is a ria, others include the River Towy and the River Loughor. On the north coast is the River Camel and the River Taw, in Essex is the Blackwater River and River Crouch
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Somalia
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Somalia, officially the Federal Republic of Somalia, is a country located in the Horn of Africa. It is bordered by Ethiopia to the west, Djibouti to the northwest, the Gulf of Aden to the north, the Indian Ocean to the east, Somalia has the longest coastline on Africas mainland, and its terrain consists mainly of plateaus, plains and highlands. Climatically, hot conditions prevail year-round, with monsoon winds. Somalia has an population of around 12.3 million. Around 85% of its residents are ethnic Somalis, who have inhabited the northern part of the country. Ethnic minorities are largely concentrated in the southern regions, the official languages of Somalia are Somali and Arabic, both of which belong to the Afroasiatic family. Most people in the country are Muslim, with the majority being Sunni, in antiquity, Somalia was an important commercial centre. It is among the most probable locations of the fabled ancient Land of Punt, during the Middle Ages, several powerful Somali empires dominated the regional trade, including the Ajuran Empire, the Adal Sultanate, the Warsangali Sultanate, and the Geledi Sultanate. The toponym Somalia was coined by the Italian explorer Luigi Robecchi Bricchetti, Italian occupation lasted until 1941, yielding to British military administration. British Somaliland would remain a protectorate, while Italian Somaliland in 1949 became a United Nations Trusteeship under Italian administration, in 1960, the two regions united to form the independent Somali Republic under a civilian government. The Supreme Revolutionary Council seized power in 1969 and established the Somali Democratic Republic, led by Mohamed Siad Barre, this government later collapsed in 1991 as the Somali Civil War broke out. Various armed factions began competing for influence in the power vacuum, during this period, due to the absence of a central government, Somalia was a failed state, and residents returned to customary and religious law in most regions. A few autonomous regions, including the Somaliland and Puntland administrations emerged in the north, the early 2000s saw the creation of fledgling interim federal administrations. The Transitional National Government was established in 2000, followed by the formation of the Transitional Federal Government in 2004, in 2006, the TFG, assisted by Ethiopian troops, assumed control of most of the nations southern conflict zones from the newly formed Islamic Courts Union. The ICU subsequently splintered into more radical groups such as Al-Shabaab, by mid-2012, the insurgents had lost most of the territory that they had seized. In 2011–2012, a political process providing benchmarks for the establishment of permanent democratic institutions was launched, within this administrative framework a new provisional constitution was passed in August 2012, which reformed Somalia as a federation. Somalia has maintained an informal economy, mainly based on livestock, remittances from Somalis working abroad, Somalia has been inhabited since at least the Paleolithic. During the Stone Age, the Doian and Hargeisan cultures flourished here, the oldest evidence of burial customs in the Horn of Africa comes from cemeteries in Somalia dating back to the 4th millennium BCE
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Ecosystem
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An ecosystem is a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system. These biotic and abiotic components are regarded as linked together through nutrient cycles, as ecosystems are defined by the network of interactions among organisms, and between organisms and their environment, they can be of any size but usually encompass specific, limited spaces. Energy, water, nitrogen and soil minerals are other essential components of an ecosystem. The energy that flows through ecosystems is obtained primarily from the sun and it generally enters the system through photosynthesis, a process that also captures carbon from the atmosphere. By feeding on plants and on one another, animals play an important role in the movement of matter and they also influence the quantity of plant and microbial biomass present. Ecosystems are controlled both by external and internal factors, other external factors include time and potential biota. Ecosystems are dynamic entities—invariably, they are subject to disturbances and are in the process of recovering from some past disturbance. Ecosystems in similar environments that are located in different parts of the world can have different characteristics simply because they contain different species. The introduction of species can cause substantial shifts in ecosystem function. Internal factors not only control ecosystem processes but are controlled by them and are often subject to feedback loops. Other internal factors include disturbance, succession and the types of species present, although humans exist and operate within ecosystems, their cumulative effects are large enough to influence external factors like climate. Biodiversity affects ecosystem function, as do the processes of disturbance, classifying ecosystems into ecologically homogeneous units is an important step towards effective ecosystem management, but there is no single, agreed-upon way to do this. The term ecosystem was first used in 1935 in a publication by British ecologist Arthur Tansley, Tansley devised the concept to draw attention to the importance of transfers of materials between organisms and their environment. He later refined the term, describing it as The whole system, including not only the organism-complex, but also the whole complex of physical factors forming what we call the environment. Tansley regarded ecosystems not simply as natural units, but as mental isolates, Tansley later defined the spatial extent of ecosystems using the term ecotope. G. Raymond Lindeman took these ideas one step further to suggest that the flow of energy through a lake was the driver of the ecosystem. Most mineral nutrients, on the hand, are recycled within ecosystems. Ecosystems are controlled both by external and internal factors, external factors, also called state factors, control the overall structure of an ecosystem and the way things work within it, but are not themselves influenced by the ecosystem
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Fresh water
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Fresh water is generally characterized by having low concentrations of dissolved salts and other total dissolved solids. The term specifically excludes seawater and brackish water although it does include mineral-rich waters such as chalybeate springs, the term sweet water has been used to describe fresh water in contrast to salt water. The term fresh water does not have the meaning as potable water. Much of the fresh water and ground water is unsuitable for drinking without some form of purification because of the presence of chemical or biological contaminants. It may also be in contact with the underlying underground water. The majority of water on Earth is in ice caps. The source of almost all water is precipitation from the atmosphere, in the form of mist, rain. Fresh water falling as mist, rain or snow contains materials dissolved from the atmosphere and material from the sea, in some cases this acid rain results in pollution of lakes and rivers. In coastal areas fresh water may contain significant concentrations of salts derived from the sea if windy conditions have lifted drops of seawater into the rain-bearing clouds. This can give rise to elevated concentrations of sodium, chloride, magnesium, significant quantities of iron may be transported in this way including the well-documented transfer of iron-rich rainfall falling in Brazil derived from sand-storms in the Sahara in north Africa. Water is an issue for the survival of all living organisms. Some can use water but many organisms including the great majority of higher plants. Out of all the water on Earth, saline water in oceans, seas and saline groundwater make up about 97% of it. Freshwater lakes contain about 87% of this surface water, including 29% in the African Great Lakes, 20% in Lake Baikal in Russia, 21% in the North American Great Lakes. Swamps have most of the balance only a small amount in rivers. In areas with no water on the ground surface, fresh water derived from precipitation may, because of its lower density. Most of the fresh water is frozen in ice sheets. Many areas suffer from lack of distribution of water, such as deserts
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Seawater
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Seawater, or salt water, is water from a sea or ocean. On average, seawater in the oceans has a salinity of about 3. 5% This means that every kilogram of seawater has approximately 35 grams of dissolved salts. Average density at the surface is 1.025 kg/l, seawater is denser than both fresh water and pure water because the dissolved salts increase the mass by a larger proportion than the volume. The freezing point of seawater decreases as salt concentration increases, at typical salinity, it freezes at about −2 °C. The coldest seawater ever recorded was in 2010, in a stream under an Antarctic glacier, seawater pH is typically limited to a range between 7.5 and 8.4. However, there is no universally accepted reference pH-scale for seawater, although the vast majority of seawater has a salinity of between 31 g/kg and 38 g/kg, seawater is not uniformly saline throughout the world. Where mixing occurs with fresh water runoff from river mouths, near melting glaciers or vast amounts precipitation, the most saline open sea is the Red Sea, where high rates of evaporation, low precipitation and low river run-off, and confined circulation result in unusually salty water. The salinity in isolated bodies of water can be considerably greater still, historically, several salinity scales were used to approximate the absolute salinity of seawater. A popular scale was the Practical Salinity Scale where salinity was measured in practical salinity units, the current standard for salinity is the Reference Salinity scale with the salinity expressed in units of g/kg. The density of surface seawater ranges from about 1020 to 1029 kg/m3, depending on the temperature, at a temperature of 25 °C, salinity of 35 g/kg and 1 atm pressure, the density of seawater is 1023.6 kg/m3. Deep in the ocean, under pressure, seawater can reach a density of 1050 kg/m3 or higher. The density of seawater also changes with salinity, brines generated by seawater desalination plants can have salinities up to 120 g/kg. The density of typical seawater brine of 120 g/kg salinity at 25 °C, seawater pH is limited to the range 7.5 to 8.4. The speed of sound in seawater is about 1,500 m/s, and varies with temperature, salinity. The thermal conductivity of seawater is 0.6 W/mK at 25 °C, the thermal conductivity decreases with increasing salinity and increases with increasing temperature. Seawater contains more dissolved ions than all types of freshwater, however, the ratios of solutes differ dramatically. Bicarbonate ions also constitute 48% of river water solutes but only 0. 14% of all seawater ions, differences like these are due to the varying residence times of seawater solutes, sodium and chlorine have very long residence times, while calcium tends to precipitate much more quickly. The most abundant dissolved ions in seawater are sodium, chloride, magnesium, sulfate and its osmolarity is about 1000 mOsm/l
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Brackish water
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Brackish water or briny water is water that has more salinity than fresh water, but not as much as seawater. It may result from mixing of seawater with fresh water, as in estuaries, the word comes from the Middle Dutch root brak. Brackish water is also the primary product of the salinity gradient power process. Because brackish water is hostile to the growth of most terrestrial plant species, without appropriate management it is damaging to the environment. Technically, brackish water contains between 0.5 and 30 grams of salt per litre—more often expressed as 0.5 to 30 parts per thousand, thus, brackish covers a range of salinity regimes and is not considered a precisely defined condition. It is characteristic of many brackish surface waters that their salinity can vary considerably over space and/or time, brackish water condition commonly occurs when fresh water meets seawater. In fact, the most extensive brackish water habitats worldwide are estuaries, the River Thames flowing through London is a classic river estuary. A similar pattern of replacement can be observed with the aquatic plants and this type of ecological succession from a freshwater to marine ecosystem is typical of river estuaries. Salmon are anadromous, meaning live in the sea but ascend rivers to spawn, eels are catadromous, living in rivers and streams. Besides the species migrate through estuaries, there are many other fish that use them as nursery grounds for spawning or as places young fish can feed. Herring and plaice are two commercially important species that use the Thames Estuary for this purpose, estuaries are also commonly used as fishing grounds, and as places for fish farming or ranching. Another important brackish water habitat is the swamp or mangal. Many, though not all, mangrove swamps fringe estuaries and lagoons where the salinity changes with each tide, like estuaries, mangrove swamps are extremely important breeding grounds for many fish, with species such as snappers, halfbeaks, and tarpon spawning or maturing among them. Mangroves represent important nesting site for numerous birds groups such as herons, storks, spoonbills, ibises, kingfishers, the Sundarbans and Bhitarkanika Mangroves are two of the large mangrove forests in the world, both on the coast of the Bay of Bengal. Some seas and lakes are brackish, the Baltic Sea is a brackish sea adjoining the North Sea. Because the salt water coming in from the sea is denser than freshwater, limited mixing occurs because of the lack of tides and storms, with the result that the fish fauna at the surface is freshwater in composition while that lower down is more marine. Cod are an example of a species found in deep water in the Baltic. The Caspian Sea is the worlds largest lake and contains brackish water with a salinity about one-third that of normal seawater, the Caspian is famous for its peculiar animal fauna, including one of the few non-marine seals and the great sturgeons, a major source of caviar
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Salt marsh
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It is dominated by dense stands of salt-tolerant plants such as herbs, grasses, or low shrubs. These plants are terrestrial in origin and are essential to the stability of the marsh in trapping and binding sediments. Salt marshes play a role in the aquatic food web. They also support terrestrial animals and provide coastal protection, salt marshes occur on low-energy shorelines in temperate and high-latitudes which can be stable or emerging, or submerging if the sedimentation rate exceeds the subsidence rate. Commonly these shorelines consist of mud or sand flats which are nourished with sediment from inflowing rivers and these typically include sheltered environments such as embankments, estuaries and the leeward side of barrier islands and spits. In the tropics and sub-tropics they are replaced by mangroves, an area that differs from a marsh in that instead of herbaceous plants. Most salt marshes have a low topography with low elevations but a vast wide area, salt marshes are located among different landforms based on their physical and geomorphological settings. Such marsh landforms include deltaic marshes, estuarine, back-barrier, open coast, embayments, deltaic marshes are associated with large rivers where many occur in Southern Europe such as the Camargue, France in the Rhone delta or the Ebro delta in Spain. They are also extensive within the rivers of the Mississippi Delta in the United States, in New Zealand, most salt marshes occur at the head of estuaries in areas where there is little wave action and high sedimentation. Such marshes are located in Awhitu Regional Park in Auckland, the Manawatu Estuary, back-barrier marshes are sensitive to the reshaping of barriers in the landward side of which they have been formed. They are common along much of the eastern coast of the United States, large, shallow coastal embayments can hold salt marshes with examples including Morecambe Bay and Portsmouth in Britain and the Bay of Fundy in North America. They have a big impact on the biodiversity of the area, salt marsh ecology involves complex food webs which include primary producers, primary consumers, and secondary consumers. The low physical energy and high grasses provide a refuge for animals, many marine fish use salt marshes as nursery grounds for their young before they move to open waters. Saltmarshes across 99 countries were mapped by Mcowen et al, a total of 5,495,089 hectares of mapped saltmarsh across 43 countries and territories are represented in a Geographic Information Systems polygon shapefile. This estimate is at the low end of previous estimates. Mats of filamentous blue-green algae can fix silt and clay sized sediment particles to their sticky sheaths on contact which can increase the erosion resistance of the sediments. This assists the process of sediment accretion to allow colonising species to grow, as a result, competitive species that prefer higher elevations relative to sea level can inhabit the area and often a succession of plant communities develops. Coastal salt marshes can be distinguished from terrestrial habitats by the tidal flow that occurs
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Beach
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A beach is a landform along a body of water. It usually consists of particles, which are often composed of rock, such as sand, gravel, shingle, pebbles. The particles comprising a beach are occasionally biological in origin, such as shells or coralline algae. Some beaches have man-made infrastructure, such as posts, changing rooms. They may also have hospitality venues nearby, wild beaches, also known as undeveloped or undiscovered beaches, are not developed in this manner. Wild beaches can be valued for their beauty and preserved nature. Beaches typically occur in areas along the coast where wave or current action deposits, although the seashore is most commonly associated with the word beach, beaches are also found by lakes and alongside large rivers. Beach may refer to, small systems where rock material moves onshore, offshore, or alongshore by the forces of waves and currents, the former are described in detail below, the larger geological units are discussed elsewhere under bars. There are several parts to a beach that relate to the processes that form. The part mostly above water, and more or less influenced by the waves at some point in the tide, is termed the beach berm. The berm is the deposit of material comprising the active shoreline, the berm has a crest and a face — the latter being the slope leading down towards the water from the crest. At the very bottom of the face, there may be a trough, at some point the influence of the waves on the material comprising the beach stops, and if the particles are small enough, winds shape the feature. Where wind is the force distributing the grains inland, the deposit behind the beach becomes a dune and these geomorphic features compose what is called the beach profile. The beach profile changes seasonally due to the change in energy experienced during summer and winter months. In temperate areas where summer is characterised by calmer seas and longer periods between breaking wave crests, the profile is higher in summer. The gentle wave action during this season tends to transport sediment up the beach towards the berm where it is deposited, onshore winds carry it further inland forming and enhancing dunes. Conversely, the profile is lower in the storm season due to the increased wave energy. The removal of sediment from the berm and dune thus decreases the beach profile
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Plant
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Plants are mainly multicellular, predominantly photosynthetic eukaryotes of the kingdom Plantae. The term is generally limited to the green plants, which form an unranked clade Viridiplantae. This includes the plants, conifers and other gymnosperms, ferns, clubmosses, hornworts, liverworts, mosses and the green algae. Green plants have cell walls containing cellulose and obtain most of their energy from sunlight via photosynthesis by primary chloroplasts and their chloroplasts contain chlorophylls a and b, which gives them their green color. Some plants are parasitic and have lost the ability to produce amounts of chlorophyll or to photosynthesize. Plants are characterized by sexual reproduction and alternation of generations, although reproduction is also common. There are about 300–315 thousand species of plants, of which the great majority, green plants provide most of the worlds molecular oxygen and are the basis of most of Earths ecologies, especially on land. Plants that produce grains, fruits and vegetables form humankinds basic foodstuffs, Plants play many roles in culture. They are used as ornaments and, until recently and in variety, they have served as the source of most medicines. The scientific study of plants is known as botany, a branch of biology, Plants are one of the two groups into which all living things were traditionally divided, the other is animals. The division goes back at least as far as Aristotle, who distinguished between plants, which generally do not move, and animals, which often are mobile to catch their food. Much later, when Linnaeus created the basis of the system of scientific classification. Since then, it has become clear that the plant kingdom as originally defined included several unrelated groups, however, these organisms are still often considered plants, particularly in popular contexts. When the name Plantae or plant is applied to a group of organisms or taxon. The evolutionary history of plants is not yet settled. Those which have been called plants are in bold, the way in which the groups of green algae are combined and named varies considerably between authors. Algae comprise several different groups of organisms which produce energy through photosynthesis, most conspicuous among the algae are the seaweeds, multicellular algae that may roughly resemble land plants, but are classified among the brown, red and green algae. Each of these groups also includes various microscopic and single-celled organisms
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Animal
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Animals are multicellular, eukaryotic organisms of the kingdom Animalia. The animal kingdom emerged as a clade within Apoikozoa as the group to the choanoflagellates. Animals are motile, meaning they can move spontaneously and independently at some point in their lives and their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later in their lives. All animals are heterotrophs, they must ingest other organisms or their products for sustenance, most known animal phyla appeared in the fossil record as marine species during the Cambrian explosion, about 542 million years ago. Animals can be divided broadly into vertebrates and invertebrates, vertebrates have a backbone or spine, and amount to less than five percent of all described animal species. They include fish, amphibians, reptiles, birds and mammals, the remaining animals are the invertebrates, which lack a backbone. These include molluscs, arthropods, annelids, nematodes, flatworms, cnidarians, ctenophores, the study of animals is called zoology. The word animal comes from the Latin animalis, meaning having breath, the biological definition of the word refers to all members of the kingdom Animalia, encompassing creatures as diverse as sponges, jellyfish, insects, and humans. Aristotle divided the world between animals and plants, and this was followed by Carl Linnaeus, in the first hierarchical classification. In Linnaeuss original scheme, the animals were one of three kingdoms, divided into the classes of Vermes, Insecta, Pisces, Amphibia, Aves, and Mammalia. Since then the last four have all been subsumed into a single phylum, in 1874, Ernst Haeckel divided the animal kingdom into two subkingdoms, Metazoa and Protozoa. The protozoa were later moved to the kingdom Protista, leaving only the metazoa, thus Metazoa is now considered a synonym of Animalia. Animals have several characteristics that set apart from other living things. Animals are eukaryotic and multicellular, which separates them from bacteria and they are heterotrophic, generally digesting food in an internal chamber, which separates them from plants and algae. They are also distinguished from plants, algae, and fungi by lacking cell walls. All animals are motile, if only at life stages. In most animals, embryos pass through a stage, which is a characteristic exclusive to animals. With a few exceptions, most notably the sponges and Placozoa and these include muscles, which are able to contract and control locomotion, and nerve tissues, which send and process signals
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Insect
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Insects are a class of hexapod invertebrates within the arthropod phylum that have a chitinous exoskeleton, a three-part body, three pairs of jointed legs, compound eyes and one pair of antennae. They are the most diverse group of animals on the planet, including more than a million described species, the number of extant species is estimated at between six and ten million, and potentially represent over 90% of the differing animal life forms on Earth. Insects may be found in all environments, although only a small number of species reside in the oceans. The life cycles of insects vary but most hatch from eggs, insect growth is constrained by the inelastic exoskeleton and development involves a series of molts. The immature stages can differ from the adults in structure, habit and habitat, Insects that undergo 3-stage metamorphosis lack a pupal stage and adults develop through a series of nymphal stages. The higher level relationship of the Hexapoda is unclear, fossilized insects of enormous size have been found from the Paleozoic Era, including giant dragonflies with wingspans of 55 to 70 cm. The most diverse insect groups appear to have coevolved with flowering plants, adult insects typically move about by walking, flying or sometimes swimming. As it allows for rapid yet stable movement, many insects adopt a tripedal gait in which they walk with their legs touching the ground in alternating triangles, Insects are the only invertebrates to have evolved flight. Many insects spend at least part of their lives under water, with adaptations that include gills. Some species, such as water striders, are capable of walking on the surface of water, Insects are mostly solitary, but some, such as certain bees, ants and termites, are social and live in large, well-organized colonies. Some insects, such as earwigs, show maternal care, guarding their eggs, Insects can communicate with each other in a variety of ways. Male moths can sense the pheromones of female moths over great distances, other species communicate with sounds, crickets stridulate, or rub their wings together, to attract a mate and repel other males. Lampyridae in the beetle order communicate with light, humans regard certain insects as pests, and attempt to control them using insecticides and a host of other techniques. Some insects damage crops by feeding on sap, leaves or fruits, a few parasitic species are pathogenic. Some insects perform complex ecological roles, blow-flies, for example, help consume carrion, Many other insects are considered ecologically beneficial as predators and a few provide direct economic benefit. Silkworms and bees have been used extensively by humans for the production of silk and honey, in some cultures, people eat the larvae or adults of certain insects. Insect first appears documented in English in 1601 in Hollands translation of Pliny, translations of Aristotles term also form the usual word for insect in Welsh, Serbo-Croatian, Russian, etc. The evolutionary relationship of insects to other animal groups remains unclear, in the Pancrustacea theory, insects, together with Entognatha, Remipedia, and Cephalocarida, make up a natural clade labeled Miracrustacea
39.
Food chain
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A food chain is a linear network of links in a food web starting from producer organisms and ending at apex predator species, detritivores, or decomposer species. A food chain also shows how the organisms are related with each other by the food they eat, each level of a food chain represents a different trophic level. A food chain differs from a web, because the complex network of different animals feeding relations are aggregated. Natural interconnections between food chains make it a food web, a common metric used to quantify food web trophic structure is food chain length. Food chains are used in ecological modeling. They are simplified abstractions of real food webs, but complex in their dynamics, food chain studies have an important role in ecotoxicology studies tracing the pathways and biomagnification of environmental contaminants. Producers, such as plants, are organisms that utilize solar or chemical energy to synthesize starch, all food chains must start with a producer. In the deep sea, food chains centered on hydrothermal vents, chemosynthetic bacteria and archaea use hydrogen sulfide and methane from hydrothermal vents and cold seeps as an energy source to produce carbohydrates, they form the base of the food chain. Consumers are organisms that eat other organisms, all organisms in a food chain, except the first organism, are consumers. Autotroph Heterotroph Lithotroph Trophic pyramid Predator-prey interaction
40.
Biodiversity
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Biodiversity, a contraction of biological diversity, generally refers to the variety and variability of life on Earth. One of the most widely used definitions defines it in terms of the variability within species and it is a measure of the variety of organisms present in different ecosystems. This can refer to genetic variation, ecosystem variation, or species variation within an area, biome, terrestrial biodiversity tends to be greater near the equator, which seems to be the result of the warm climate and high primary productivity. Biodiversity is not distributed evenly on Earth, and is richest in the tropics and these tropical forest ecosystems cover less than 10 per cent of earths surface, and contain about 90 percent of the worlds species. Marine biodiversity tends to be highest along coasts in the Western Pacific, there are latitudinal gradients in species diversity. Biodiversity generally tends to cluster in hotspots, and has been increasing through time, the number and variety of plants, animals and other organisms that exist is known as biodiversity. It is a component of nature and it ensures the survival of human species by providing food, fuel, shelter, medicines. The richness of biodiversity depends on the conditions and area of the region. All species of plants taken together are known as flora and about 300,000 species of plants are known to date, all species of animals taken together are known as fauna which includes birds, mammals, fish, reptiles, insects, crustaceans, molluscs, etc. Rapid environmental changes typically cause mass extinctions, more than 99 percent of all species, amounting to over five billion species, that ever lived on Earth are estimated to be extinct. Estimates on the number of Earths current species range from 10 million to 14 million, of which about 1.2 million have been documented and over 86 percent have not yet been described. More recently, in May 2016, scientists reported that 1 trillion species are estimated to be on Earth currently with only one-thousandth of one percent described, the total amount of related DNA base pairs on Earth is estimated at 5.0 x 1037 and weighs 50 billion tonnes. In comparison, the mass of the biosphere has been estimated to be as much as 4 TtC. In July 2016, scientists reported identifying a set of 355 genes from the Last Universal Common Ancestor of all living on Earth. The age of the Earth is about 4.54 billion years old, there are microbial mat fossils found in 3.48 billion-year-old sandstone discovered in Western Australia. Other early physical evidence of a substance is graphite in 3.7 billion-year-old meta-sedimentary rocks discovered in Western Greenland. More recently, in 2015, remains of life were found in 4.1 billion-year-old rocks in Western Australia. According to one of the researchers, If life arose relatively quickly on Earth, then it could be common in the universe
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Marblehead, Massachusetts
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Marblehead is a coastal New England town in Essex County, Massachusetts. Its population was 19,808 at the 2010 census and it is home to the Marblehead Neck Wildlife Sanctuary, Crocker Park, the Marblehead Lighthouse, Fort Sewall, Little Harbor and Devereux Beach. Archibald Willards famous painting The Spirit of 76 currently resides in Abbot Hall and it is also the origin of Marine Corps Aviation. A center of recreational boating, it is a sailing, kayaking and fishing destination. Several yacht clubs were established here in the late 19th century, Marbleheads first European settler was Joseph Doliber in 1629, who set up on the shore near what is now the end of Bradlee Road. Three years earlier, Isaac Allerton, a Pilgrim from the Mayflower, had arrived in the area and established a village at mid-Marblehead Harbor on the town side. This area was set off and incorporated separately in 1649, originally called Massebequash after the river which ran between it and Salem, the land was inhabited by the Naumkeag tribe of the Pawtucket confederation under the overall sachem Nanepashemet. But epidemics in 1615–1619 and 1633, believed to be smallpox, on September 16,1684, heirs of Nanepashemet sold their 3,700 acres, the deed is preserved today at Abbot Hall in the city. At times called Marvell Head, Marble Harbour and Foy, the town would be named Marblehead by settlers who mistook its granite ledges for marble and it began as a fishing village with narrow, crooked streets, and developed inland from the harbor. The shoreline smelled of drying fish, typically cod and these were exported abroad and to Salem. The town peaked economically just prior to the Revolution, as locally financed privateering vessels sought bounty from large European ships, much early architecture survives from the era, including the Jeremiah Lee Mansion. A large percentage of residents became involved early in the Revolutionary War, the first vessel commissioned for the navy, Hannah, was equipped with cannons, rope, provision —and a crew from Marblehead. With their nautical backgrounds, soldiers from Marblehead under General John Glover were instrumental in the escape of the Continental Army after the Battle of Long Island, Marblehead men ferried George Washington across the Delaware River for his attack on Trenton. Many who set out for war, however, did not return, the community lost a substantial portion of its population and economy, although it was still the tenth-largest inhabited location in the United States at the first census, in 1790. When George Washington visited the town during his tour of 1789, he knew the sailors of Marblehead well. He observed that the town had the appearance of antiquity, at the beginning of the 19th century, wealthier citizens wanted a new bank to finance vessels, and to serve the town’s fishermen and merchants. On March 17,1831, with a capital of $100,000, the name was changed to National Grand Bank on October 3,1864. After the Revolution, fishing continued as a major industry, the towns fishermen had 98 vessels putting to sea in 1837, where they often harvested fish off the Grand Banks of Newfoundland
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House
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Houses use a range of different roofing systems to keep precipitation such as rain from getting into the dwelling space. Houses may have doors or locks to secure the dwelling space, most conventional modern houses in Western cultures will contain one or more bedrooms and bathrooms, a kitchen or cooking area, and a living room. A house may have a dining room, or the eating area may be integrated into another room. Some large houses in North America have a recreation room, in traditional agriculture-oriented societies, domestic animals such as chickens or larger livestock may share part of the house with humans. The social unit that lives in a house is known as a household, most commonly, a household is a family unit of some kind, although households may also be other social groups, such as roommates or, in a rooming house, unconnected individuals. Some houses only have a space for one family or similar-sized group. A house may be accompanied by outbuildings, such as a garage for vehicles or a shed for gardening equipment, a house may have a backyard or frontyard, which serve as additional areas where inhabitants can relax or eat. The English word house derives directly from the Old English Hus meaning dwelling, shelter, home, house, the house itself gave rise to the letter B through an early Proto-Semitic hieroglyphic symbol depicting a house. The symbol was called bayt, bet or beth in various related languages, and became beta, ideally, architects of houses design rooms to meet the needs of the people who will live in the house. Such designing, known as design, has become a popular subject in universities. Feng shui can also mean the aura in or around a dwelling, making it comparable to the real-estate sales concept of indoor-outdoor flow, the square footage of a house in the United States reports the area of living space, excluding the garage and other non-living spaces. The square metres figure of a house in Europe reports the area of the enclosing the home. The number of floors or levels making up the house can affect the square footage of a home, many houses have several large rooms with specialized functions and several very small rooms for other various reasons. These may include an area, a sleeping area, and separate or combined washing. Some larger properties may also feature such as a spa room, indoor pool, indoor basketball court. In traditional agriculture-oriented societies, domestic animals such as chickens or larger livestock often share part of the house with human beings, most conventional modern houses will at least contain a bedroom, bathroom, kitchen or cooking area, and a living room. Little is known about the earliest origin of the house and its interior, roman architect Vitruvius theories have claimed the first form of architecture as a frame of timber branches finished in mud, also known as the primitive hut. Philip Tabor later states the contribution of 17th century Dutch houses as the foundation of houses today, as far as the idea of the home is concerned, the home of the home is the Netherlands
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Tiburon, California
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Tiburon is an incorporated town in Marin County, California. It is located on the Tiburon Peninsula, which reaches south into the San Francisco Bay, the smaller city of Belvedere occupies the south-west part of the peninsula and is contiguous with Tiburon. Tiburon is bordered by Corte Madera to the north and Mill Valley to the west, besides Belvedere and Tiburon, much of the peninsula is unincorporated, including portions of the north side and the communities of Strawberry and Paradise Cay. The population of Tiburon was 8,962 at the 2010 census, Belvedere and Tiburon share a post office. The citys name derives from the Spanish word tiburón, which means shark, the name was first given to the peninsula on which the city is situated, and probably inspired by the prevalence of locally native leopard sharks in the surrounding waters. Tiburon was formerly the terminus of the Northwestern Pacific Railroad. It is now a commuter and tourist town, linked by fast ferry services to San Francisco and with a concentration of restaurants and it is the nearest mainland point to Angel Island and a regular ferry service connects to the island. Earliest human habitation of the area was by Native Americans. In 1884, the first post office in Tiburon opened, Tiburon has a Town Historian, Branwell Fanning. Much of the modern history material below is drawn from his Brief History of Tiburon and he named the land Punta del Tiburon, or Shark Point. The Coast Miwok Indians had lived here for thousands of years, Reed married Hilaria Sanchez, daughter of the commandante of the San Francisco Presidio in 1836. The Reed name is preserved on streets, subdivisions, and the school district. Various forms of Hilarias name, and that of her granddaughter Hilarita Reed, are found on streets, a development. Hilarita married Dr. Benjamin Lyford, who became the first land developer with his Lyfords Hygeia, the Benjamin and Hilarita Lyford House, formerly located on their dairy farm on Strawberry Point, is now a feature of the Audubon Societys Western Headquarters and Sanctuary on Greenwood Beach Road. Life changed little in the 40 years between the death of John Reed in 1842 and the arrival of Peter Donahue in 1882, Donahue brought with him the San Francisco and North Pacific Railroad. He made a deal with the Reed family for a right-of-way, blasted out the rock at Point Tiburon, the passenger ferries took commuters and automobiles to San Francisco and Sausalito, while barges carried loaded freight cars to San Francisco and Richmond. Wildflowers surround Old St. Hilary’s, Tiburons iconic hillside landmark and it has served as a schoolroom and town meeting hall and is now a popular setting for weddings, concerts and other memorable events. The last railroad operated passenger ferry left Tiburon in 1941, but the passenger, passenger ferry service was resumed in the 1960s when Harbor Carriers utilized sightseeing boats in the early morning and evening hours
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Visakhapatnam
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Visakhapatnam is the largest city, both in terms of area and population in the Indian state of Andhra Pradesh. It is located on the coast of Bay of Bengal in the eastern region of the state. It is the headquarters of Visakhapatnam district and also the Financial Capital of Andhra Pradesh. As of 2011, the population of the city was recorded as 2,035,922, making it the 14th largest city in the country, Visakhapatnam Port is the fifth busiest port in India in terms of cargo handled. Visakhapatnam is home to the oldest shipyard and the natural harbour on the east coast of India. Visakhapatnams history stretches back to the 6th century BCE, historically, it was considered part of the Kalinga ancient region, and later ruled by the Vengi kingdom, the Pallava and Eastern Ganga dynasties. Conquered by the Mughals in the 16th century, European powers eventually set up trading interests in the city, control passed to the British in 1804 and it remained under British colonial rule until Indias independence in 1947. After independence, Visakhapatnam developed into one of the chief ports. The city is located between the Eastern Ghats mountain range and the Bay of Bengal, and is known as The Jewel of the East Coast, The City of Destiny. Visakhapatnams beaches, parks, museums, and proximity to areas of beauty have helped the city become a significant tourist destination. Visakhapatnam has been selected as one of the hundred Indian cities to be developed as a city under PM Narendra Modis flagship Smart Cities Mission. Visakhapatnam was ranked as the fifth cleanest city in India according to the governments Swachhta Sarvekshan rankings, the name Visakhapatnam was derived from the shrine of God Visakha, built by a King of Andhrain 4th century. The city coordinates lies between 17. 6883° N latitude, and 83. 2186° E longitude and its periphery consists of plains along the coast line while the interiors boast of the beautiful hills of the Eastern Ghats which surround it on the North and the West. This region is called the Agency Division. It occupies an area of approximately 11,161 km2, visakhapatnams history stretches back to the 6th century B. C. E. and the city finds mention in ancient texts, such as the 4th century B. C. E. Historically considered part of the Kalinga region, it was ruled by the Vengi kingdom, archaeological records suggest that the present city was built around the 11th and 12th centuries C. E. by the Chola Dynasty king Kulothunga I. Control over the city fluctuated between the Chola Dynasty of Tamil Nadu and the Gajapati Kingdom of Odisha until its conquest by the Vijayanagara Empire in the 15th century, in the 16th century, it was conquered by the Mughals. European powers eventually set up trading interests in the city, the city was ruled by Andhra Kings of Vengi and Pallavas
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India
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India, officially the Republic of India, is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and it is bounded by the Indian Ocean on the south, the Arabian Sea on the southwest, and the Bay of Bengal on the southeast. It shares land borders with Pakistan to the west, China, Nepal, and Bhutan to the northeast, in the Indian Ocean, India is in the vicinity of Sri Lanka and the Maldives. Indias Andaman and Nicobar Islands share a border with Thailand. The Indian subcontinent was home to the urban Indus Valley Civilisation of the 3rd millennium BCE, in the following millennium, the oldest scriptures associated with Hinduism began to be composed. Social stratification, based on caste, emerged in the first millennium BCE, early political consolidations took place under the Maurya and Gupta empires, the later peninsular Middle Kingdoms influenced cultures as far as southeast Asia. In the medieval era, Judaism, Zoroastrianism, Christianity, and Islam arrived, much of the north fell to the Delhi sultanate, the south was united under the Vijayanagara Empire. The economy expanded in the 17th century in the Mughal empire, in the mid-18th century, the subcontinent came under British East India Company rule, and in the mid-19th under British crown rule. A nationalist movement emerged in the late 19th century, which later, under Mahatma Gandhi, was noted for nonviolent resistance, in 2015, the Indian economy was the worlds seventh largest by nominal GDP and third largest by purchasing power parity. Following market-based economic reforms in 1991, India became one of the major economies and is considered a newly industrialised country. However, it continues to face the challenges of poverty, corruption, malnutrition, a nuclear weapons state and regional power, it has the third largest standing army in the world and ranks sixth in military expenditure among nations. India is a constitutional republic governed under a parliamentary system. It is a pluralistic, multilingual and multi-ethnic society and is home to a diversity of wildlife in a variety of protected habitats. The name India is derived from Indus, which originates from the Old Persian word Hindu, the latter term stems from the Sanskrit word Sindhu, which was the historical local appellation for the Indus River. The ancient Greeks referred to the Indians as Indoi, which translates as The people of the Indus, the geographical term Bharat, which is recognised by the Constitution of India as an official name for the country, is used by many Indian languages in its variations. Scholars believe it to be named after the Vedic tribe of Bharatas in the second millennium B. C. E and it is also traditionally associated with the rule of the legendary emperor Bharata. Gaṇarājya is the Sanskrit/Hindi term for republic dating back to the ancient times, hindustan is a Persian name for India dating back to the 3rd century B. C. E. It was introduced into India by the Mughals and widely used since then and its meaning varied, referring to a region that encompassed northern India and Pakistan or India in its entirety
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Harbor
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A harbor or harbour, or haven, is a body of water where ships, boats and barges seek shelter from stormy weather, or are stored for future use. Ports are often located in harbors, harbors can be natural or artificial. An artificial harbor can have deliberately constructed breakwaters, sea walls, or jettys, or they can be constructed by dredging, in contrast, a natural harbor is surrounded on several sides by prominences of land. Examples of natural harbors include Sydney Harbour, Australia and Trincomalee Harbour in Sri Lanka, artificial harbors are frequently built for use as ports. The oldest artificial harbor known is the Ancient Egyptian site at Wadi al-Jarf, on the Red Sea coast, the largest artificially created harbor is Jebel Ali in Dubai. The Ancient Carthaginians constructed fortified, artificial harbors called cothons, a natural harbor is a landform where a part of a body of water is protected and deep enough to furnish anchorage. Natural harbors have long been of great strategic naval and economic importance, having a protected harbor reduces or eliminates the need for breakwaters as it will result in calmer waves inside the harbor. For harbors near the North and South Poles, being ice-free is an important advantage, the worlds southmost harbor, located at Antarcticas Winter Quarters Bay, is potentially ice-free, depending on the summertime pack ice conditions. Although the worlds busiest port is a hotly contested title, in 2006 the worlds busiest harbor by cargo tonnage was the Port of Shanghai
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Port
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A port is a location on a coast or shore containing one or more harbors where ships can dock and transfer people or cargo to or from land. Port locations are selected to optimize access to land and navigable water, for commercial demand, Ports with deeper water are rarer, but can handle larger ships. Since ports throughout history handled every kind of traffic, support and storage facilities vary widely, may extend for miles, some ports have an important military role. One of the worlds oldest known artificial harbors is at Wadi al-Jarf on the Red Sea, along with the finding of harbor structures, ancient anchors have also been found. Guangzhou was an important port during the ancient times as far back as the Qin Dynasty, canopus was the principal port in Egypt for Greek trade before the foundation of Alexandria. Athens port of Piraeus was the base for the Athenian fleet, lothal is one of the most prominent cities of the ancient Indus valley civilisation, located in the Bhāl region of the modern state of Gujarāt and dating from 3700 BCE. Ostia Antica was the port of ancient Rome with Portus established by Claudius, Ports often have cargo-handling equipment, such as cranes and forklifts for use in loading ships, which may be provided by private interests or public bodies. Often, canneries or other processing facilities will be located nearby, some ports feature canals, which allow ships further movement inland. Access to intermodal transportation, such as railroads and highways, is critical to a port, so that passengers, Ports with international traffic have customs facilities. Harbor pilots and tugboats may maneuver large ships in tight quarters when near docks, the terms port and seaport are used for different types of port facilities that handle ocean-going vessels, and river port is used for river traffic, such as barges and other shallow-draft vessels. An inland port is a port on a lake, river, or canal with access to a sea or ocean. An example of this is the St. Lawrence Seaway which allows ships to travel from the Atlantic Ocean several thousand kilometers inland to Great Lakes ports like Duluth-Superior, a fishing port is a port or harbor for landing and distributing fish. It may be a facility, but it is usually commercial. A fishing port is the port that depends on an ocean product. In recent decades, regulations to save fishing stock may limit the use of a fishing port, a dry port is an inland intermodal terminal directly connected by road or rail to a seaport and operating as a centre for the transshipment of sea cargo to inland destinations. A warm-water port is one where the water does not freeze in wintertime, because they are available year-round, warm-water ports can be of great geopolitical or economic interest. A seaport is further categorized as a port or a cargo port. Additionally, cruise ports are known as a home port or a port of call
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Landlocked country
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A landlocked state or landlocked country is a sovereign state entirely enclosed by land, or whose only coastlines lie on closed seas. There are currently 49 such countries, including five partially recognised states, only two, Bolivia and Paraguay in South America, lie outside Afro-Eurasia. As a rule, being landlocked creates political and economic handicaps that access to the high seas avoids, for this reason, states large and small across history have striven to gain access to open waters, even at great expense in wealth, bloodshed, and political capital. The economic disadvantages of being landlocked can be alleviated or aggravated depending on degree of development, language barriers, some historically landlocked countries are quite affluent, such as Switzerland, Luxembourg, and Austria, all of which frequently employ neutrality to their political advantage. The majority, however, are classified as Landlocked Developing Countries,9 of the 12 countries with the lowest Human Development Indices are landlocked. Historically, being landlocked has been disadvantageous to a countrys development and it cuts a nation off from such important sea resources as fishing, and impedes or prevents direct access to seaborne trade, a crucial component of economic and social advance. As such, coastal regions tended to be wealthier and more populated than inland ones. Paul Collier in his book The Bottom Billion argues that being landlocked in a poor geographic neighborhood is one of four major development traps by which a country can be held back. In general, he found that when a neighboring country experiences better growth, for landlocked countries, the effect is particularly strong, as they are limited in their trading activity with the rest of the world. He states, If you are coastal, you serve the world, if you are landlocked, others have argued that being landlocked may actually be a blessing as it creates a natural tariff barrier which protects the country from cheap imports. In some instances, this has led to more robust local food systems, Landlocked developing countries have significantly higher costs of international cargo transportation compared to coastal developing countries. Since Bosnia and Herzegovina is a new country, railways and ports have not been built for its need, there is no freight port along its short coastline at Neum, making it effectively landlocked, although there are plans to change this. Instead the port of Ploče in Croatia is used, after World War I, in the Treaty of Versailles, a part of Germany designated the Polish corridor was given to the new Second Polish Republic, for access to the Baltic Sea. This gave Poland a short coastline, but without a large harbour and this was also the pretext for making Danzig with its harbour the Free City of Danzig, to which Poland was given free access. However, the Germans placed obstacles to free access, especially when it came to military material. In response, the fishing harbour of Gdynia was soon greatly enlarged. Stettin was annexed by Poland after World War II, but Hamburg continued the contract so that part of the port may still be used for sea trade by a successor of Czechoslovakia, the Czech Republic. The Danube is a waterway, and thus landlocked Austria, Hungary, Moldova, Serbia
Chisholm, Hugh, ed. (1911). "Coast". Encyclopædia Britannica. 6 (11th ed.). Cambridge University Press. p. 599.
Chisholm, Hugh, ed. (1911). "
