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Create AccountEcology 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).
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.
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.
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.
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.
Canada's dairy-products industry is made up of companies that process raw milk and cream.
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.
Frogs are amphibians belonging to the order Anura. The adult, typically, has no tail or ribs, longer hind limbs than forelimbs, well-developed eyes and skin equipped with mucus and venom glands.
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.
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.
Early land plants have long been known from Eastern Canada, thanks to pioneering work by Sir J. William Dawson, father of Devonian palaeobotany and principal of McGill University from 1855 to 1893. But this record poorly represented the earliest phase of land colonization.
Feathers are only found on birds. They probably evolved as a temperature-control device from scales, much like those of modern reptiles.
The Subarctic covers a relatively large area in eastern Canada; its western counterpart, formed where Pacific and Arctic waters meet and mix, is restricted to a narrow band along the shore of the Beaufort Sea (see Coastal Waters).
