1.
Pacific Ocean
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The Pacific Ocean is the largest and deepest of the Earths oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean in the south and is bounded by Asia and Australia in the west, the Mariana Trench in the western North Pacific is the deepest point in the world, reaching a depth of 10,911 metres. Both the center of the Water Hemisphere and the Western Hemisphere are in the Pacific Ocean, the oceans current name was coined by Portuguese explorer Ferdinand Magellan during the Spanish circumnavigation of the world in 1521, as he encountered favourable winds on reaching the ocean. He called it Mar Pacífico, which in both Portuguese and Spanish means peaceful sea, important human migrations occurred in the Pacific in prehistoric times. Long-distance trade developed all along the coast from Mozambique to Japan, trade, and therefore knowledge, extended to the Indonesian islands but apparently not Australia. By at least 878 when there was a significant Islamic settlement in Canton much of trade was controlled by Arabs or Muslims. In 219 BC Xu Fu sailed out into the Pacific searching for the elixir of immortality, from 1404 to 1433 Zheng He led expeditions into the Indian Ocean. The east side of the ocean was discovered by Spanish explorer Vasco Núñez de Balboa in 1513 after his expedition crossed the Isthmus of Panama and he named it Mar del Sur because the ocean was to the south of the coast of the isthmus where he first observed the Pacific. Later, Portuguese explorer Ferdinand Magellan sailed the Pacific East to West on a Castilian expedition of world circumnavigation starting in 1519, Magellan called the ocean Pacífico because, after sailing through the stormy seas off Cape Horn, the expedition found calm waters. The ocean was often called the Sea of Magellan in his honor until the eighteenth century, sailing around and east of the Moluccas, between 1525 and 1527, Portuguese expeditions discovered the Caroline Islands, the Aru Islands, and Papua New Guinea. In 1542–43 the Portuguese also reached Japan, in 1564, five Spanish ships consisting of 379 explorers crossed the ocean from Mexico led by Miguel López de Legazpi and sailed to the Philippines and Mariana Islands. The Manila galleons operated for two and a half centuries linking Manila and Acapulco, in one of the longest trade routes in history, Spanish expeditions also discovered Tuvalu, the Marquesas, the Cook Islands, the Solomon Islands, and the Admiralty Islands in the South Pacific. In the 16th and 17th century Spain considered the Pacific Ocean a Mare clausum—a sea closed to other naval powers, as the only known entrance from the Atlantic the Strait of Magellan was at times patrolled by fleets sent to prevent entrance of non-Spanish ships. On the western end of the Pacific Ocean the Dutch threatened the Spanish Philippines, Spain also sent expeditions to the Pacific Northwest reaching Vancouver Island in southern Canada, and Alaska. The French explored and settled Polynesia, and the British made three voyages with James Cook to the South Pacific and Australia, Hawaii, and the North American Pacific Northwest, one of the earliest voyages of scientific exploration was organized by Spain in the Malaspina Expedition of 1789–1794. It sailed vast areas of the Pacific, from Cape Horn to Alaska, Guam and the Philippines, New Zealand, Australia, and the South Pacific. Growing imperialism during the 19th century resulted in the occupation of much of Oceania by other European powers, and later, Japan, in Oceania, France got a leading position as imperial power after making Tahiti and New Caledonia protectorates in 1842 and 1853 respectively. After navy visits to Easter Island in 1875 and 1887, Chilean navy officer Policarpo Toro managed to negotiate an incorporation of the island into Chile with native Rapanui in 1888, by occupying Easter Island, Chile joined the imperial nations
2.
Tonga
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Tonga, officially the Kingdom of Tonga, is a Polynesian sovereign state and archipelago comprising 169 islands of which 36 are inhabited. The total surface area is about 750 square kilometres scattered over 700,000 square kilometres of the southern Pacific Ocean and it has a population of 103,000 people of whom 70% reside on the main island of Tongatapu. Tonga stretches across approximately 800 kilometres in a north-south line and it is surrounded by Fiji and Wallis and Futuna to the northwest, Samoa to the northeast, Niue to the east, Kermadec to the southwest, and New Caledonia and Vanuatu to the farther west. Tonga became known in the West as the Friendly Islands because of the reception accorded to Captain James Cook on his first visit in 1773. He arrived at the time of the festival, the yearly donation of the First Fruits to the Tuʻi Tonga. According to the writer William Mariner, the wanted to kill Cook during the gathering. From 1900 to 1970, Tonga had British protected state status, the country never relinquished its sovereignty to any foreign power. In many Polynesian languages including Tongan, the word tonga means south, the name of Tonga is cognate to the Hawaiian region of Kona. In Malay, the name of Tonga is also cognate to the word Tenggara, an Austronesian-speaking group linked to the archaeological construct known as the Lapita cultural complex reached and inhabited Tonga around 1500–1000 BCE. Scholars have much debated the exact dates of the settlement of Tonga. Not much is known before European contact because of the lack of a writing system, in the 15th century and again in the 17th, civil war erupted. The Tongan people first encountered Europeans in 1616 when the Dutch vessel Eendracht, captained by Willem Schouten, later came other Dutch explorers, including Jacob Le Maire, and in 1643 Abel Tasman. In 1845, the young warrior, strategist, and orator Tāufaʻāhau united Tonga into a kingdom. He held the title of Tuʻi Kanokupolu, but had been baptised by Methodist missionaries with the name Siaosi in 1831. Tonga became a state under a Treaty of Friendship with Britain on 18 May 1900. The treaty posted no higher permanent representative on Tonga than a British Consul, under the protection of Britain, Tonga maintained its sovereignty, and remained the only Pacific nation to retain its monarchical government. The Tongan monarchy follows a succession of hereditary rulers from one family. The 1918 flu pandemic, brought to Tonga by a ship from New Zealand, killed 1,800 Tongans, the Treaty of Friendship and Tongas protection status ended in 1970 under arrangements established by Queen Salote Tupou III prior to her death in 1965
3.
God
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In monotheism, God is conceived of as the Supreme Being and principal object of faith. The concept of God as described by most theologians includes the attributes of omniscience, omnipotence, omnipresence, divine simplicity, many theologians also describe God as being omnibenevolent and all loving. Furthermore, some religions attribute only a purely grammatical gender to God, incorporeity and corporeity of God are related to conceptions of transcendence and immanence of God, with positions of synthesis such as the immanent transcendence of Chinese theology. God has been conceived as personal or impersonal. In theism, God is the creator and sustainer of the universe, while in deism, God is the creator, in pantheism, God is the universe itself. In atheism, God is not believed to exist, while God is deemed unknown or unknowable within the context of agnosticism, God has also been conceived as the source of all moral obligation, and the greatest conceivable existent. Many notable philosophers have developed arguments for and against the existence of God, there are many names for God, and different names are attached to different cultural ideas about Gods identity and attributes. In the ancient Egyptian era of Atenism, possibly the earliest recorded monotheistic religion, this deity was called Aten, premised on being the one true Supreme Being and creator of the universe. In the Hebrew Bible and Judaism, He Who Is, I Am that I Am, in the Christian doctrine of the Trinity, God, consubstantial in three persons, is called the Father, the Son, and the Holy Spirit. In Judaism, it is common to refer to God by the titular names Elohim or Adonai, in Islam, the name Allah is used, while Muslims also have a multitude of titular names for God. In Hinduism, Brahman is often considered a concept of God. In Chinese religion, God is conceived as the progenitor of the universe, intrinsic to it, other religions have names for God, for instance, Baha in the Baháí Faith, Waheguru in Sikhism, and Ahura Mazda in Zoroastrianism. The earliest written form of the Germanic word God comes from the 6th-century Christian Codex Argenteus, the English word itself is derived from the Proto-Germanic * ǥuđan. The reconstructed Proto-Indo-European form * ǵhu-tó-m was likely based on the root * ǵhau-, in the English language, the capitalized form of God continues to represent a distinction between monotheistic God and gods in polytheism. The same holds for Hebrew El, but in Judaism, God is also given a proper name, in many translations of the Bible, when the word LORD is in all capitals, it signifies that the word represents the tetragrammaton. Allāh is the Arabic term with no plural used by Muslims and Arabic speaking Christians and Jews meaning The God, Ahura Mazda is the name for God used in Zoroastrianism. Mazda, or rather the Avestan stem-form Mazdā-, nominative Mazdå and it is generally taken to be the proper name of the spirit, and like its Sanskrit cognate medhā, means intelligence or wisdom. Both the Avestan and Sanskrit words reflect Proto-Indo-Iranian *mazdhā-, from Proto-Indo-European mn̩sdʰeh1, literally meaning placing ones mind, Waheguru is a term most often used in Sikhism to refer to God
4.
Spain
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By population, Spain is the sixth largest in Europe and the fifth in the European Union. Spains capital and largest city is Madrid, other urban areas include Barcelona, Valencia, Seville, Bilbao. Modern humans first arrived in the Iberian Peninsula around 35,000 years ago, in the Middle Ages, the area was conquered by Germanic tribes and later by the Moors. Spain is a democracy organised in the form of a government under a constitutional monarchy. It is a power and a major developed country with the worlds fourteenth largest economy by nominal GDP. Jesús Luis Cunchillos argues that the root of the span is the Phoenician word spy. Therefore, i-spn-ya would mean the land where metals are forged, two 15th-century Spanish Jewish scholars, Don Isaac Abravanel and Solomon ibn Verga, gave an explanation now considered folkloric. Both men wrote in two different published works that the first Jews to reach Spain were brought by ship by Phiros who was confederate with the king of Babylon when he laid siege to Jerusalem. This man was a Grecian by birth, but who had given a kingdom in Spain. He became related by marriage to Espan, the nephew of king Heracles, Heracles later renounced his throne in preference for his native Greece, leaving his kingdom to his nephew, Espan, from whom the country of España took its name. Based upon their testimonies, this eponym would have already been in use in Spain by c.350 BCE, Iberia enters written records as a land populated largely by the Iberians, Basques and Celts. Early on its coastal areas were settled by Phoenicians who founded Western Europe´s most ancient cities Cadiz, Phoenician influence expanded as much of the Peninsula was eventually incorporated into the Carthaginian Empire, becoming a major theater of the Punic Wars against the expanding Roman Empire. After an arduous conquest, the peninsula came fully under Roman Rule, during the early Middle Ages it came under Germanic rule but later, much of it was conquered by Moorish invaders from North Africa. In a process took centuries, the small Christian kingdoms in the north gradually regained control of the peninsula. The last Moorish kingdom fell in the same year Columbus reached the Americas, a global empire began which saw Spain become the strongest kingdom in Europe, the leading world power for a century and a half, and the largest overseas empire for three centuries. Continued wars and other problems led to a diminished status. The Napoleonic invasions of Spain led to chaos, triggering independence movements that tore apart most of the empire, eventually democracy was peacefully restored in the form of a parliamentary constitutional monarchy. Spain joined the European Union, experiencing a renaissance and steady economic growth
5.
Frigate
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A frigate /ˈfrɪɡᵻt/ is any of several types of warship, the term having been used for ships of various sizes and roles over the last few centuries. In the 17th century, this term was used for any warship built for speed and maneuverability and these could be warships carrying their principal batteries of carriage-mounted guns on a single deck or on two decks. The term was used for ships too small to stand in the line of battle. In the late 19th century, the frigate was a type of ironclad warship that for a time was the most powerful type of vessel afloat. The term frigate was used because such ships still mounted their principal armaments on a continuous upper deck. Ship classes dubbed frigates have more closely resembled corvettes, destroyers, cruisers. The rank frigate captain derives from the name of type of ship. The term frigate originated in the Mediterranean in the late 15th century, referring to a lighter galleass type ship with oars, sails and a light armament, built for speed and maneuverability. The etymology of the word is unknown, although it may have originated as a corruption of aphractus, aphractus was, in turn, derived from the Ancient Greek phrase ἄφρακτος ναῦς, or undefended ship. In 1583, during the Eighty Years War, Habsburg Spain recovered the Southern Netherlands from the rebellious Dutch and this soon led to the occupied ports being used as bases for privateers, the Dunkirkers, to attack the shipping of the Dutch and their allies. To achieve this they developed small, maneuverable, sailing vessels that came to be referred to as frigates, in French, the term frigate became a verb, meaning to build long and low, and an adjective, adding further confusion. Even the huge English Sovereign of the Seas could be described as a frigate by a contemporary after her upper decks were reduced in 1651. The navy of the Dutch Republic was the first navy to build the larger ocean-going frigates, the first two tasks required speed, shallowness of draft for the shallow waters around the Netherlands, and the ability to carry sufficient supplies to maintain a blockade. The third task required heavy armament, sufficient to fight against the Spanish fleet, the first of these larger battle-capable frigates were built around 1600 at Hoorn in Holland. The effectiveness of the Dutch frigates became most visible in the Battle of the Downs in 1639, encouraging most other navies, especially the English, to adopt similar designs. The fleets built by the Commonwealth of England in the 1650s generally consisted of ships described as frigates, the largest of which were two-decker great frigates of the third rate. Carrying 60 guns, these vessels were as big and capable as great ships of the time, however, most other frigates at the time were used as cruisers, independent fast ships. The term frigate implied a long hull design, which relates directly to speed and also, in turn, in Danish, the word fregat is often applied to warships carrying as few as 16 guns, such as HMS Falcon which the British classified as a sloop
6.
Europe
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Europe is a continent that comprises the westernmost part of Eurasia. Europe is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, yet the non-oceanic borders of Europe—a concept dating back to classical antiquity—are arbitrary. Europe covers about 10,180,000 square kilometres, or 2% of the Earths surface, politically, Europe is divided into about fifty sovereign states of which the Russian Federation is the largest and most populous, spanning 39% of the continent and comprising 15% of its population. Europe had a population of about 740 million as of 2015. Further from the sea, seasonal differences are more noticeable than close to the coast, Europe, in particular ancient Greece, was the birthplace of Western civilization. The fall of the Western Roman Empire, during the period, marked the end of ancient history. Renaissance humanism, exploration, art, and science led to the modern era, from the Age of Discovery onwards, Europe played a predominant role in global affairs. Between the 16th and 20th centuries, European powers controlled at times the Americas, most of Africa, Oceania. The Industrial Revolution, which began in Great Britain at the end of the 18th century, gave rise to economic, cultural, and social change in Western Europe. During the Cold War, Europe was divided along the Iron Curtain between NATO in the west and the Warsaw Pact in the east, until the revolutions of 1989 and fall of the Berlin Wall. In 1955, the Council of Europe was formed following a speech by Sir Winston Churchill and it includes all states except for Belarus, Kazakhstan and Vatican City. Further European integration by some states led to the formation of the European Union, the EU originated in Western Europe but has been expanding eastward since the fall of the Soviet Union in 1991. The European Anthem is Ode to Joy and states celebrate peace, in classical Greek mythology, Europa is the name of either a Phoenician princess or of a queen of Crete. The name contains the elements εὐρύς, wide, broad and ὤψ eye, broad has been an epithet of Earth herself in the reconstructed Proto-Indo-European religion and the poetry devoted to it. For the second part also the divine attributes of grey-eyed Athena or ox-eyed Hera. The same naming motive according to cartographic convention appears in Greek Ανατολή, Martin Litchfield West stated that phonologically, the match between Europas name and any form of the Semitic word is very poor. Next to these there is also a Proto-Indo-European root *h1regʷos, meaning darkness. Most major world languages use words derived from Eurṓpē or Europa to refer to the continent, in some Turkic languages the originally Persian name Frangistan is used casually in referring to much of Europe, besides official names such as Avrupa or Evropa
7.
New Spain
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New Spain was a colonial territory of the Spanish Empire, in the New World north of the Isthmus of Panama. It was established following the Spanish conquest of the Aztec Empire in 1521, after 1535 the colony was governed by the Viceroy of New Spain, an appointed minister of the King of Spain, who ruled as monarch over the colony. The capital of New Spain was Mexico City and it developed highly regional divisions, which reflect the impact of climate, topography, the presence or absence of dense indigenous populations, and the presence or absence of mineral resources. The areas of central and southern Mexico had dense indigenous populations with complex social, political, silver mining not only became the engine of the economy of New Spain, but vastly enriched Spain, and transformed the global economy. New Spain was the New World terminus of the Philippine trade, although New Spain was a dependency of Spain, it was a kingdom not a colony, subject to the presiding monarch on the Iberian Peninsula. Every privilege and position, economic political, or religious came from him and it was on this basis that the conquest, occupation, and government of the New World was achieved. The Viceroyalty of New Spain was established in 1535 in the Kingdom of New Spain and it was the first New World viceroyalty and one of only two in the Spanish empire until the 18th century Bourbon Reforms. The Spanish Empire comprised the territories in the north overseas Septentrion, from North America, to the west of the continent, New Spain also included the Spanish East Indies. To the east of the continent, it included the Spanish West Indies and this was not occupied by many Spanish settlers and were considered more marginal to Spanish interests than the most densely populated and lucrative areas of central Mexico. To shore up its claims in North America starting in the late 18th century, Spanish expeditions to the Pacific Northwest explored and claimed the coast of what is now British Columbia and Alaska. The indigenous societies of Mesoamerica brought under Spanish control were of unprecedented complexity, the societies could provide the conquistadors, especially Hernán Cortés, a base from which the conquerors could become autonomous, or even independent, of the Crown. As a result, the Holy Roman Emperor and King of Spain, since the time of the Catholic Monarchs, central Iberia was governed through councils appointed by the monarch with particular jurisdictions. Thus, the creation of the Council of the Indies became another, the crown had set up the Casa de Contratación in 1503 to regulate contacts between Spain and its overseas possessions. A key function was to gather information about navigation to make trips less risky and they were accompanied by maps of the area discussed, many of which were drawn by indigenous artists. The Francisco Hernández Expedition, the first scientific expedition to the New World, was sent to gather information medicinal plants, an earlier Audiencia had been established in Santo Domingo in 1526 to deal with the Caribbean settlements. That Audiencia, housed in the Casa Reales in Santo Domingo, was charged with encouraging further exploration, management by the Audiencia, which was expected to make executive decisions as a body, proved unwieldy. Therefore, in 1535, King Charles V named Don Antonio de Mendoza as the first Viceroy of New Spain. After the Spanish conquest of the Inca Empire in 1532 opened up the vast territories of South America to further conquests, the Crown established an independent Viceroyalty of Peru there in 1540
8.
James Cook
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Captain James Cook FRS RN was a British explorer, navigator, cartographer, and captain in the Royal Navy. Cook joined the British merchant navy as a teenager and joined the Royal Navy in 1755 and he saw action in the Seven Years War, and subsequently surveyed and mapped much of the entrance to the Saint Lawrence River during the siege of Quebec. This helped bring Cook to the attention of the Admiralty and Royal Society, in three voyages Cook sailed thousands of miles across largely uncharted areas of the globe. He mapped lands from New Zealand to Hawaii in the Pacific Ocean in greater detail, as he progressed on his voyages of discovery he surveyed and named features, and recorded islands and coastlines on European maps for the first time. He displayed a combination of seamanship, superior surveying and cartographic skills, physical courage, Cook was attacked and killed while attempting to kidnap the native chief of Hawaii during his third exploratory voyage in the Pacific in 1779. He left a legacy of scientific and geographical knowledge which was to influence his successors well into the 20th century, and numerous memorials worldwide have been dedicated to him. James Cook was born on 7 November 1728 in the village of Marton in Yorkshire and baptised on 14 November in the church of St Cuthbert. He was the second of eight children of James Cook, a Scottish farm labourer from Ednam in Roxburghshire, in 1736, his family moved to Airey Holme farm at Great Ayton, where his fathers employer, Thomas Skottowe, paid for him to attend the local school. In 1741, after five years schooling, he work for his father. For leisure, he would climb a hill, Roseberry Topping, enjoying the opportunity for solitude. Cooks Cottage, his parents last home, which he is likely to have visited, is now in Melbourne, having moved from England and reassembled, brick by brick. In 1745, when he was 16, Cook moved 20 miles to the village of Staithes. Historians have speculated that this is where Cook first felt the lure of the sea while gazing out of the shop window. After 18 months, not proving suitable for work, Cook travelled to the nearby port town of Whitby to be introduced to friends of Sandersons, John. The Walkers, who were Quakers, were prominent local ship-owners in the coal trade and their house is now the Captain Cook Memorial Museum. Cook was taken on as a merchant navy apprentice in their fleet of vessels. His first assignment was aboard the collier Freelove, and he spent several years on this and various other coasters, sailing between the Tyne and London. As part of his apprenticeship, Cook applied himself to the study of algebra, geometry, trigonometry, navigation and his three-year apprenticeship completed, Cook began working on trading ships in the Baltic Sea
9.
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
10.
Coral reef
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Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals. Coral reefs are built by colonies of tiny animals found in waters that contain few nutrients. Most coral reefs are built from stony corals, which in turn consist of polyps that cluster in groups, the polyps belong to a group of animals known as Cnidaria, which also includes sea anemones and jellyfish. Unlike sea anemones, corals secrete hard carbonate exoskeletons which support, most reefs grow best in warm, shallow, clear, sunny and agitated waters. Often called rainforests of the sea, shallow coral reefs form some of the most diverse ecosystems on Earth, paradoxically, coral reefs flourish even though they are surrounded by ocean waters that provide few nutrients. They are most commonly found at depths in tropical waters. Coral reefs deliver ecosystem services to tourism, fisheries and shoreline protection, the annual global economic value of coral reefs is estimated between US$29. 8-375 billion. However, coral reefs are fragile ecosystems, partly because they are sensitive to water temperature. Most of the coral reefs we can see today were formed after the last glacial period when melting ice caused the sea level to rise and this means that most modern coral reefs are less than 10,000 years old. As communities established themselves on the shelves, the reefs grew upwards, Reefs that rose too slowly could become drowned reefs. They are covered by so much water there was insufficient light. Coral reefs are found in the sea away from continental shelves, around oceanic islands. The vast majority of islands are volcanic in origin. The few exceptions have tectonic origins where plate movements have lifted the deep ocean floor on the surface. In 1842 in his first monograph, The Structure and Distribution of Coral Reefs, Charles Darwin set out his theory of the formation of atoll reefs and he theorized uplift and subsidence of the Earths crust under the oceans formed the atolls. Darwin’s theory sets out a sequence of three stages in atoll formation and it starts with a fringing reef forming around an extinct volcanic island as the island and ocean floor subsides. As the subsidence continues, the reef becomes a barrier reef. Darwin predicted that underneath each lagoon would be a bed rock base, where the level of the underlying earth allows, the corals grow around the coast to form what he called fringing reefs, and can eventually grow out from the shore to become a barrier reef
11.
Fjord
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Geologically, a fjord or fiord is a long, narrow inlet with steep sides or cliffs, created by glacial erosion. Norways coastline is estimated at 29,000 kilometres with 1,190 fjords, a fjord is formed when a glacier cuts a U-shaped valley by ice segregation and abrasion of the surrounding bedrock. Glacial melting is accompanied by the rebounding of Earths crust as the ice load, in some cases this rebound is faster than sea level rise. Most fjords are deeper than the adjacent sea, Sognefjord, Norway, fjords generally have a sill or shoal at their mouth caused by the previous glaciers reduced erosion rate and terminal moraine. In many cases this causes extreme currents and large saltwater rapids. Saltstraumen in Norway is often described as the worlds strongest tidal current and these characteristics distinguish fjords from rias, which are drowned valleys flooded by the rising sea. Drammensfjorden is cut almost in two by the Svelvik ridge, a moraine that during the ice cover was under sea level. During the winter there is usually little inflow of freshwater. Surface water and deeper water are mixed during winter because of the cooling of the surface. In the deep there is still fresh water from the summer with less density than the saltier water along the coast. Offshore wind, common in the areas during winter, sets up a current on the surface from the inner to the outer parts. This current on the surface in turn pulls dense salt water from the coast across the fjord threshold, during the summer season there is usually a large inflow of river water in the inner areas. This freshwater gets mixed with saltwater creating a layer of water with a slightly higher surface than the ocean which in turn sets up a current from the river mouths towards the ocean. This current is more salty towards the coast and right under the surface current there is a reverse current of saltier water from the coast. In the deeper parts of the fjord the cold water remaining from winter is still, fjords with a shallow threshold this deep water is not replaced every year and low oxygen concentration makes the deep water unsuitable for fish and animals. In the most extreme cases there is a constant barrier of freshwater on the surface, gaupnefjorden branch of Sognefjorden is strongly affected by freshwater as glacial river flow in. Velfjorden has little inflow of freshwater, as late as 2000, some coral reefs were discovered along the bottoms of the Norwegian fjords. These reefs were found in fjords from the north of Norway to the south, the marine life on the reefs is believed to be one of the most important reasons why the Norwegian coastline is such a generous fishing ground
12.
Soil
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Soil is a mixture of minerals, organic matter, gases, liquids, and countless organisms that together support life on Earth. Soil is called the Skin of the Earth and interfaces with the lithosphere, the hydrosphere, the atmosphere, the term pedolith, used commonly to refer to the soil, literally translates ground stone. Soil consists of a phase of minerals and organic matter, as well as a porous phase that holds gases. Accordingly, soils are often treated as a system of solids, liquids. Soil is a product of the influence of climate, relief, organisms, Soil continually undergoes development by way of numerous physical, chemical and biological processes, which include weathering with associated erosion. Given its complexity and strong internal connectedness soil has been considered as an ecosystem by soil ecologists. Most soils have a dry bulk density between 1.1 and 1.6 g/cm3, while the particle density is much higher. Little of the soil of planet Earth is older than the Pleistocene and none is older than the Cenozoic, Soil science has two basic branches of study, edaphology and pedology. Edaphology is concerned with the influence of soils on living things, pedology is focused on the formation, description, and classification of soils in their natural environment. In engineering terms, soil is referred to as regolith, or loose material that lies above the solid geology. Soil is commonly referred to as earth or dirt, technically, as soil resources serve as a basis for food security, the international community advocates its sustainable and responsible use through different types of soil governance. Soil is a component of the Earths ecosystem. The worlds ecosystems are impacted in far-reaching ways by the carried out in the soil, from ozone depletion and global warming, to rainforest destruction. Following the atmosphere, the soil is the next largest carbon reservoir on Earth, as the planet warms, soils will add carbon dioxide to the atmosphere due to its increased biological activity at higher temperatures. Thus, soil carbon losses likely have a positive feedback response to global warming. Since soil has a range of available niches and habitats. A gram of soil can contain billions of organisms, belonging to thousands of species, mostly microbial, Soil has a mean prokaryotic density of roughly 108 organisms per gram, whereas the ocean has no more than 107 procaryotic organisms per milliliter of seawater. Since plant roots need oxygen, ventilation is an important characteristic of soil and this ventilation can be accomplished via networks of interconnected soil pores, which also absorb and hold rainwater making it readily available for plant uptake
