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Create AccountBetween about 100 000 and 12 000 years ago, the whole area of Québec as well as a major part of the northern hemisphere was covered with a thick layer of ice. In the late PLEISTOCENE era, just over 12 000 years ago, Québec underwent a gradual warming of the atmosphere.
Keystone XL was a proposed 1,947 km long pipeline project that would have carried crude oil from Alberta to Nebraska. It was owned by Calgary-based TC Energy Corporation. The pipeline was named XL for “export limited.” First proposed in July 2008, it was the prospective fourth phase of TC Energy’s existing Keystone Pipeline system. In Canada, Keystone XL had the support of both the federal and Alberta governments. However, the project faced significant opposition and legal challenges on environmental grounds. In January 2021, United States president Joe Biden cancelled its permit on his first day in office. On 9 June 2021, TC Energy and the Alberta government announced the termination of the Keystone XL pipeline.
Ecology is subdivided into 3 fields of study: autecology (relations of individual species or populations to their milieu), synecology (composition of living communities) and dynecology (processes of change in related communities).
A forest region is a major geographic belt or zone characterized by a broad uniformity both in physiography and in the composition of the dominant tree species. Canada can be divided into eight forest regions.
Insects are small invertebrates (more than 75% of known species are less than 6 mm long) with 3 pairs of legs, 1 or 2 pairs of wings (or lacking wings) and a segmented body.
Hydro-Québec, a provincially owned corporation based in Montréal, is Canada's largest electric utility and, judged by assets ($30.6 billion in 1986), Canada's second largest corporation.
A spring is a point of natural, concentrated groundwater discharge from soil or rock.
Fragmented rock materials formed by mechanical weathering are normally larger than clay particles. These materials constitute major sources of sediment for later erosion, transportation and deposition under the impetus of gravity, wind, water or ice.
Canada's dairy-products industry is made up of companies that process raw milk and cream.
Mantids are carnivorous insects of the order Mantodea, known for their prayer-like posture. Mantids are most closely related to cockroaches and termites. There are about 2,400 species worldwide, most of which are found in the tropics. Only three species are found in Canada: the European mantis (Mantis religiosa), the Chinese mantid (Tenodera aridifolia) and the ground mantid (Litaneutriaminor). Of these three species only the ground mantid, found in southern British Columbia, is native.
Although mantis is sometimes used to refer to the entire group, most entomologists prefer to use that word for members of the genus Mantis.
Over a century’s worth of shifting environmental policy means that today, maintaining Canada’s forests is as important as cutting them down. Tree planting is an essential part of this maintenance, and each year thousands of young Canadians trek through rough conditions and remote areas to replant thousands of trees.
The tissues and body fluids of animals are subject to the same types of abnormal structural and functional changes as are those of humans. Causes and circumstances may differ but the disease processes are very similar.
Inuit and subarctic Indigenous peoples have traversed the North since time immemorial. Indigenous knowledge and modes of transportation helped early European explorers and traders travel and survive on these expanses. Later settlement depended to an extraordinary degree on the development of transportation systems. Today, the transportation connections of northern communities vary from place to place. While the most remote settlements are often only accessible by air, some have road, rail and marine connections. These are often tied to industrial projects such as mines.
JOHN SIMMONS steps over the trunk of a splintered spruce, lets out a weary sigh and points off to the left, over the twisted, mangled corpses of pines and birches lining Sailors' Memorial Way in HALIFAX'S Point Pleasant Park. "There's one we can save," says Halifax's urban forest supervisor.
Bridges, train trestles and elevated highways collapsed, sending hapless passengers plummeting to their deaths. Apartment buildings crumpled and fell, crushing terrified occupants still huddled in their beds.
Then, Margaret's son, Allan, urged her to stay with him in Ottawa - but all trains in and out of the two cities were cancelled, and roads closed. Meanwhile, Allan, his wife, Lori, and their three young sons hosted nine neighborhood boys whose own homes were without power.
Arctic sovereignty is a key part of Canada’s history and future. The country has 162,000 km of Arctic coastline. Forty per cent of Canada’s landmass is in its three northern territories. Sovereignty over the area has become a national priority for Canadian governments in the 21st century. There has been growing international interest in the Arctic due to resource development, climate change, control of the Northwest Passage and access to transportation routes. As Prime Minister Stephen Harper said in 2008, “The geopolitical importance of the Arctic and Canada’s interests in it have never been greater.”
Uranium oxide was first identified in 1789 by M.H. Klaproth in the MINERAL pitchblende, but its distinctive property of radioactivity was discovered much later (1896) by Henri Becquerel.
The name asbestos comes from a Greek word meaning "inextinguishable" (often mistaken to mean "incombustible"). Asbestos is a collective term that is used to designate 2 separate groups of silicates: the serpentine group and the amphibole group.
The Earth is actually not in orbit around the sun but around the centre of mass of the Earth-sun system. Since all parts of the Earth move in the same orbit, they experience the same acceleration, but only at the Earth's centre is this acceleration exactly balanced by the sun's gravitation.
