Browse "Nature & Geography"

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Planet and Satellite

The diameter of a world is a significant value because, given the same densities, the surface gravity will vary roughly with the diameter. A diameter of 350 km is the approximate dividing line between the larger, near-spherical bodies and the smaller objects of irregular shape.

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Dams and Diversions

Overall, Canada is blessed with abundant freshwater resources, but their availability varies considerably from one season or year to another, and from one region to another.

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Canals and Inland Waterways

These 2 great journeys were first made just before the end of the 18th century, and by the same man. Alexander Mackenzie reached the mouth of the river which now bears his name in 1789, and was the first European to cross the North American continent (to Bella Coola) in 1793.

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Bird Sanctuaries and Reserves

Protection may be achieved by various means, including land-use zoning, long-term agreements with landowners and outright acquisition of land by wildlife agencies. Protected land areas may be designated as national wildlife areas, conservation areas, game reserves, etc.

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Anemone

Anemone, or wind flower, perennial, herbaceous plant of genus Anemone, family Ranunculaceae.

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Animal

Animal evolution has resulted in a vast number of adaptations for successful life under all sorts of conditions, so that there are now more kinds of animals than of all other living things combined.

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Animal Disease

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.

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Animal Issues

Anything involving animals that creates public interest and publicity, no matter how briefly it maintains that interest, may be considered an animal issue.

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Bear (Animal)

Bears (of the family Ursidae) are stocky, bob-tailed mammals with 5 clawed toes on each paw. Three species inhabit Canada.

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Animal Breeding

Domestication was performed through controlled mating and reproduction of captive animals which were selected and mated based on their behaviour and temperament.

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Fossil Animals

The first animals were microscopic in size and left no known fossil remains. The oldest animal fossils occur in sediments deposited under shallow equatorial seas over 600 million years ago.

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Arctic Animals

Arctic animals are those that have adapted physically and behaviourally to the particular conditions of life in the most northerly regions on the planet.

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Animals in Winter

Winter is the season that begins December 21 (winter solstice) and ends on March 21 (spring Equinox). In Canada cold and snow is associated with this season.

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Endangered Animals in Canada

Many animals in Canada face the risk of extinction. Animals are put at risk for several reasons, including: climate change, the loss of forest and grassland to cities and agriculture, hunting, fishing, and the pollution of lakes and rivers. As of 2018, a total of 771 species were considered at risk in Canada, including 531 animals. (Other species at risk include plants; see also Endangered Plants in Canada.)