In geology, bedrock is the lithified rock that lies under a loose softer material called regolith within the surface of the crust of the Earth or other terrestrial planets. Bedrock refers to the substructure composed of hard rock exposed or buried at the earths surface, an exposed portion of bedrock is called an outcrop. Bedrock may have various chemical and mineralogical compositions and can be igneous, metamorphic or sedimentary in origin; the bedrock may be overlain by weathered regolith which includes soil and the subsoil. The surface of the bedrock beneath the soil cover is known as rockhead in engineering geology, its identification by digging, drilling or geophysical methods is an important task in most civil engineering projects. Superficial deposits can be thick, such that the bedrock lies hundreds of meters below the surface. Bedrock when exposed or within the subsurface may experience weathering and erosion by external factors. Weathering may be physical or chemical and alters the structure of the rock and may cause it to erode and or alter over time based on the interactions between the mineralogy and its interactions.
Bedrock may experience subsurface weathering at its upper boundary, forming saprolite. A geologic map of an area will show the distribution of differing bedrock types, rock that would be exposed at the surface if all soil or other superficial deposits were removed. Geology – The study of the composition, physical properties, history of Earth's components, the processes by which they are shaped. Outcrop Regolith – A layer of loose, heterogeneous superficial deposits covering solid rock Soil – mixture of organic matter, gases and organisms that together support life Weathering – Breaking down of rocks and minerals as well as artificial materials through contact with the Earth's atmosphere and waters Rafferty, John P. "Bedrock GEOLOGY". Encyclopedia Britannica. Encyclopedia Britannica. Retrieved 1 April 2019. Harris, The Gale Encyclopedia of Science. Ed. K. Lee Lerner and Brenda Wilmoth Lerner. Vol. 1. 5th ed. Farmington Hills, MI: Gale, 2014. P515-516. Media related to Bedrock at Wikimedia Commons
Canada is a country in the northern part of North America. Its ten provinces and three territories extend from the Atlantic to the Pacific and northward into the Arctic Ocean, covering 9.98 million square kilometres, making it the world's second-largest country by total area. Canada's southern border with the United States is the world's longest bi-national land border, its capital is Ottawa, its three largest metropolitan areas are Toronto and Vancouver. As a whole, Canada is sparsely populated, the majority of its land area being dominated by forest and tundra, its population is urbanized, with over 80 percent of its inhabitants concentrated in large and medium-sized cities, many near the southern border. Canada's climate varies across its vast area, ranging from arctic weather in the north, to hot summers in the southern regions, with four distinct seasons. Various indigenous peoples have inhabited what is now Canada for thousands of years prior to European colonization. Beginning in the 16th century and French expeditions explored, settled, along the Atlantic coast.
As a consequence of various armed conflicts, France ceded nearly all of its colonies in North America in 1763. In 1867, with the union of three British North American colonies through Confederation, Canada was formed as a federal dominion of four provinces; this began an accretion of provinces and territories and a process of increasing autonomy from the United Kingdom. This widening autonomy was highlighted by the Statute of Westminster of 1931 and culminated in the Canada Act of 1982, which severed the vestiges of legal dependence on the British parliament. Canada is a parliamentary democracy and a constitutional monarchy in the Westminster tradition, with Elizabeth II as its queen and a prime minister who serves as the chair of the federal cabinet and head of government; the country is a realm within the Commonwealth of Nations, a member of the Francophonie and bilingual at the federal level. It ranks among the highest in international measurements of government transparency, civil liberties, quality of life, economic freedom, education.
It is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many other countries. Canada's long and complex relationship with the United States has had a significant impact on its economy and culture. A developed country, Canada has the sixteenth-highest nominal per capita income globally as well as the twelfth-highest ranking in the Human Development Index, its advanced economy is the tenth-largest in the world, relying chiefly upon its abundant natural resources and well-developed international trade networks. Canada is part of several major international and intergovernmental institutions or groupings including the United Nations, the North Atlantic Treaty Organization, the G7, the Group of Ten, the G20, the North American Free Trade Agreement and the Asia-Pacific Economic Cooperation forum. While a variety of theories have been postulated for the etymological origins of Canada, the name is now accepted as coming from the St. Lawrence Iroquoian word kanata, meaning "village" or "settlement".
In 1535, indigenous inhabitants of the present-day Quebec City region used the word to direct French explorer Jacques Cartier to the village of Stadacona. Cartier used the word Canada to refer not only to that particular village but to the entire area subject to Donnacona. From the 16th to the early 18th century "Canada" referred to the part of New France that lay along the Saint Lawrence River. In 1791, the area became two British colonies called Upper Canada and Lower Canada collectively named the Canadas. Upon Confederation in 1867, Canada was adopted as the legal name for the new country at the London Conference, the word Dominion was conferred as the country's title. By the 1950s, the term Dominion of Canada was no longer used by the United Kingdom, which considered Canada a "Realm of the Commonwealth"; the government of Louis St. Laurent ended the practice of using'Dominion' in the Statutes of Canada in 1951. In 1982, the passage of the Canada Act, bringing the Constitution of Canada under Canadian control, referred only to Canada, that year the name of the national holiday was changed from Dominion Day to Canada Day.
The term Dominion was used to distinguish the federal government from the provinces, though after the Second World War the term federal had replaced dominion. Indigenous peoples in present-day Canada include the First Nations, Métis, the last being a mixed-blood people who originated in the mid-17th century when First Nations and Inuit people married European settlers; the term "Aboriginal" as a collective noun is a specific term of art used in some legal documents, including the Constitution Act 1982. The first inhabitants of North America are hypothesized to have migrated from Siberia by way of the Bering land bridge and arrived at least 14,000 years ago; the Paleo-Indian archeological sites at Old Crow Flats and Bluefish Caves are two of the oldest sites of human habitation in Canada. The characteristics of Canadian indigenous societies included permanent settlements, complex societal hierarchies, trading networks; some of these cultures had collapsed by the time European explorers arrived in the late 15th and early 16th centuries and have only been discovered through archeological investigations.
The indigenous population at the time of the first European settlements is estimated to have been between 200,000
Bay of Fundy
The Bay of Fundy is a bay between the Canadian provinces of New Brunswick and Nova Scotia, with a small portion touching the US state of Maine. It has an high tidal range. Portions of the Bay of Fundy, Shepody Bay and Minas Basin, form one of six Canadian sites in the Western Hemisphere Shorebird Reserve Network, are classified as a Hemispheric site, it is administered by the provinces of New Brunswick and Nova Scotia, the Canadian Wildlife Service, is managed in conjunction with Ducks Unlimited Canada and the Nature Conservancy of Canada. Some sources believe the name "Fundy" is a corruption of the French word Fendu, meaning "split", while others believe it comes from the Portuguese funda, meaning "deep"; the bay was named Baie Française by Samuel de Champlain during a 1604 expedition to St. Croix Island; the Bay of Fundy has a high tidal range. Oceanographers attribute it to tidal resonance resulting from a coincidence of timing: the time it takes a large wave to go from the mouth of the bay to the inner shore and back is the same as the time from one high tide to the next.
During the 12.4-hour tidal period, 115 billion tonnes of water flow out of the bay. According to the Canadian Hydrographic Service, there is a 16.8-metre tidal range in Leaf Basin for Ungava Bay and 17 metres at Burntcoat Head for the Bay of Fundy. The range at Leaf Basin is higher on average than at Minas Basin; the highest water level recorded in the Bay of Fundy system occurred at the head of the Minas Basin on the night of October 4–5, 1869 during a tropical cyclone named the "Saxby Gale". The water level of 21.6 metres resulted from the combination of high winds, abnormally low atmospheric pressure, a spring tide. The tides in the Bay of Fundy are semidiurnal, which means that they have two highs and two lows each day; the height that the water rises and falls to each day during these tides are equal. There are six hours and thirteen minutes between each high and low tide. Alternative forms of energy are being explored in depth in a number of unique areas. Tidal energy harnesses the movement of ocean water to generate electricity through a number of mechanisms.
A process of gathering tidal energy called "In-stream turbine technology" is being tested in the Minas Passage, Nova Scotia. This project is being spearheaded by the Fundy Ocean Research Centre for Energy or FORCE. In-stream tidal turbine technology is a simple design. An elevated turbine is submerged under water in a location that enables its movement with tidal cycles; as the blades of the turbine move, they create energy. From here the power travels to a cable attached to the seafloor and back to an offsite facility, where it can be added to the power grid. While this technology has shown to be successful in its early stages of testing, FORCE has not begun the process for energy collection. However, the installation of the undersea cable in December 2013 indicates that the project is moving along swiftly. A megawatt-scale turbine was installed at Cape Sharp near Partridge Island in November 2016, its owner, Open Hydro, went into insolvency in August 2018. The Bay of Fundy lies in a rift valley called the Fundy Basin.
These flood basalts poured out over the landscape. Sections of the flood basalts have been eroded away, but still form a basaltic mountain range known as North Mountain; as a result, much of the basin floor is made of tholeiitic basalts giving its brown colour. The rift valley failed as the Mid-Atlantic Ridge continued to separate North America and Africa; the upper part of the bay splits into Chignecto Bay in the northeast and the Minas Basin in the east. Chignecto Bay is further subdivided into Cumberland Basin and Shepody Bay and the extreme eastern portion of Minas Basin is called Cobequid Bay; some of these upper reaches exhibit exposed red bay muds. Cape Chignecto defines Chignecto Bay whereas Cape Split defines the Minas Channel, leading to the Minas Basin; the Minas Channel connects the Minas Basin with the main body of the bay. The channel is 5.6 kilometres across and 106.7 metres deep. The tides that flow through the channel are powerful, they are as powerful as 25 million horses. Facing Cape Split at the entrance to the Minas Channel are the basalt cliffs of Cape d'Or.
The lower part of the bay is home to four important sub-basins: Passamaquoddy Bay and Back Bay on the New Brunswick shore, Cobscook Bay on the Maine shore, the Annapolis Basin on the Nova Scotia shore. The bay is home to several islands, the largest of, Grand Manan at the boundary with the Gulf of Maine. Other important islands on the north side of the bay include Campobello Island, Moose Island, Deer Island in the Passamaquoddy Bay area. Brier Island and Long Island can be found on the south side of the bay while Isle Haute is in the upper bay off Cape Chignecto. Smaller islands and islets exist in Passamaquoddy Bay, Back Bay, Annapolis Basin; the Five Islands, in the Minas Basin, are scenic. The Bay of Fundy is home to another interesting geologic feature, the Hopewell Rocks formation; this formation is where the "famous flower-pot rocks" are l
Halifax, Nova Scotia
Halifax, formally known as the Halifax Regional Municipality, is the capital of the Canadian province of Nova Scotia. It had a population of 403,131 with 316,701 in the urban area centred on Halifax Harbour; the regional municipality consists of four former municipalities that were amalgamated in 1996: Halifax, Dartmouth and Halifax County. Halifax is a major economic centre in Atlantic Canada with a large concentration of government services and private sector companies. Major employers and economic generators include the Department of National Defence, Dalhousie University, Saint Mary's University, the Halifax Shipyard, various levels of government, the Port of Halifax. Agriculture, mining and natural gas extraction are major resource industries found in the rural areas of the municipality. Halifax is located within the traditional ancestral lands of the Mi'kmaq indigenous peoples, known as Mi'kma'ki; the Mi'kmaq have resided in Nova Scotia, New Brunswick and Prince Edward Island since prior to European landings in North America in the 1400s and 1500s to set up fisheries.
The Mi'kmaq name for Halifax is K'jipuktuk, pronounced "che-book-took". The first permanent European settlement in the region was on the Halifax Peninsula; the establishment of the Town of Halifax, named after the 2nd Earl of Halifax, in 1749 led to the colonial capital being transferred from Annapolis Royal. The establishment of Halifax marked the beginning of Father Le Loutre's War; the war began when Edward Cornwallis arrived to establish Halifax with 13 transports and a sloop of war on June 21, 1749. By unilaterally establishing Halifax, the British were violating earlier treaties with the Mi'kmaq, which were signed after Father Rale's War. Cornwallis brought along their families. To guard against Mi'kmaq and French attacks on the new Protestant settlements, British fortifications were erected in Halifax, Bedford and Lawrencetown, all areas within the modern-day Regional Municipality. St. Margaret's Bay was first settled by French-speaking Foreign Protestants at French Village, Nova Scotia who migrated from Lunenburg, Nova Scotia during the American Revolution.
December 1917 saw one of the greatest disasters in Canadian history, when the SS Mont-Blanc, a French cargo ship carrying munitions, collided with the Belgian Relief vessel SS Imo in "The Narrows" between upper Halifax Harbour and Bedford Basin. The resulting explosion, the Halifax Explosion, devastated the Richmond District of Halifax, killing 2,000 people and injuring nearly 9,000 others; the blast was the largest artificial explosion before the development of nuclear weapons. Significant aid came from Boston; the four municipalities in the Halifax urban area had been coordinating service delivery through the Metropolitan Authority since the late 1970s, but remained independent towns and cities until April 1, 1996, when the provincial government amalgamated all municipal governments within Halifax County to create the Halifax Regional Municipality. The municipal boundary thus now includes all of Halifax County except for several First Nation reserves. Since amalgamation, the region has been known as the Halifax Regional Municipality, although "Halifax" has remained in common usage for brevity.
On April 15, 2014, the regional council approved the implementation of a new branding campaign for the region developed by the local firm Revolve Marketing. The campaign would see the region referred to in promotional materials as "Halifax", although "Halifax Regional Municipality" would remain the region's official name; the proposed rebranding was met with mixed reaction from residents, some of whom felt that the change would alienate other communities in the municipality through a perception that the marketing scheme would focus on Metropolitan Halifax only, while others expressed relief that the longer formal name would no longer be primary. Mayor Mike Savage defended the decision, stating: "I'm a Westphal guy, I'm a Dartmouth man, but Halifax is my city, we’re all part of Halifax. Why does that matter? Because when I go and travel on behalf of this municipality, there isn’t a person out there who cares what HRM means." Unlike most municipalities with a sizeable metropolitan area, the Halifax Regional Municipality's suburbs have been incorporated into the "central" municipality by referendum.
For example, the community of Spryfield, in the Mainland South area, voted to amalgamate with Halifax in 1968. The most recent amalgamation, which brought the entirety of Halifax County into the Municipality, has created a situation where a large "rural commutershed" area encompasses half the municipality's landmass; the Halifax Regional Municipality occupies an area of 5,577 km2, 10% of the total land area of Nova Scotia. The land area of HRM is comparable in size to the total land area of the province of Prince Edward Island, measures 165 km in length between its eastern and western-most extremities, excluding Sable Island; the nearest point of land to Sable Island is not in HRM, but rather in adjacent Guysborough County. However, Sable Island is considered part of District 7 of the Halifax Regional Council; the coastline is indented, accounting for its length of 400 km, with the northern boundary of the municipality being between 50–60 km inland. The coast is rock with small isolated sand beaches in sheltered bays.
The largest coastal features include St. Margarets Bay, Halifax Harbour/Bedford Basin, Cole Harbour, Musquodoboit Harbour, Jeddore Harbour, Ship Harbour, Sheet Harbou
A lake is an area filled with water, localized in a basin, 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, therefore are distinct from lagoons, are larger and deeper than ponds, though there are no official or scientific definitions. Lakes can be contrasted with rivers or streams, which are flowing. Most lakes streams. Natural lakes are found in mountainous areas, rift zones, areas with ongoing glaciation. Other lakes are found 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. Many lakes are artificial and are constructed for industrial or agricultural use, for hydro-electric power generation or domestic water supply, or for aesthetic, recreational purposes, or other activities.
The word lake comes from Middle English lake, from Old English lacu, from Proto-Germanic *lakō, from the Proto-Indo-European root *leǵ-. Cognates include Dutch laak, Middle Low German lāke as in: de:Wolfslake, de:Butterlake, German Lache, Icelandic lækur. Related are the English words leak and leach. There is considerable uncertainty about defining the difference between lakes and ponds, no current internationally accepted definition of either term across scientific disciplines or political boundaries exists. For example, limnologists have defined lakes as water bodies which are a larger version of a pond, which can have wave action on the shoreline or where wind-induced turbulence plays a major role in mixing the water column. None of these definitions excludes ponds and all are difficult to measure. For this reason, simple size-based definitions are used to separate ponds and lakes. Definitions for lake range in minimum sizes for a body of water from 2 hectares to 8 hectares. 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, a dry basin most of the time but may become filled under seasonal conditions of heavy rainfall. In common usage, many lakes bear names ending with the word pond, a lesser number of names ending with lake are in quasi-technical fact, ponds. One textbook illustrates this point with the following: "In Newfoundland, for example every lake is called a pond, whereas in Wisconsin every pond is called a lake."One hydrology book proposes to define the term "lake" as a body of water with the following five characteristics: it or fills one or several basins connected by straits has the same water level in all parts it does not have regular intrusion of seawater a considerable portion of the sediment suspended in the water is captured by the basins the area measured at the mean water level exceeds an arbitrarily chosen threshold With the exception of the seawater intrusion criterion, the others have been accepted or elaborated upon by other hydrology publications.
The majority of lakes on Earth are freshwater, most lie in the Northern Hemisphere at higher latitudes. Canada, with a deranged drainage system has an estimated 31,752 lakes larger than 3 square kilometres and an unknown total number of lakes, but is estimated to be at least 2 million. Finland has larger, of which 56,000 are large. Most lakes have at least one natural outflow in the form of a river or stream, which maintain a lake's average level by allowing the drainage of excess water; some lakes do not have a natural outflow and lose water by evaporation or underground seepage or both. They are termed endorheic lakes. Many lakes are artificial and are constructed for hydro-electric power generation, aesthetic purposes, recreational purposes, industrial use, agricultural use or domestic water supply. Evidence of extraterrestrial lakes exists. Globally, lakes are outnumbered by ponds: of an estimated 304 million standing water bodies worldwide, 91% are 1 hectare or less in area. Small lakes are much more numerous than large lakes: in terms of area, one-third of the world's standing water is represented by lakes and ponds of 10 hectares or less.
However, large lakes account for much of the area of standing water with 122 large lakes of 1,000 square kilometres or more representing about 29% of the total global area of standing inland water. Hutchinson in 1957 published a monograph, regarded as a landmark discussion and classification of all major lake types, their origin, morphometric characteristics, distribution; as summarized and discussed by these researchers, Hutchinson presented in it a comprehensive analysis of the origin of lakes and proposed what is a accepted classification of lakes according to their origin. This