Browse "Nature & Geography"

Displaying 481-495 of 740 results

  • Article

    Oldman River Society Case

    Several decisions of the Supreme Court relate to environmental protection: Dryden Chemicals, Crown Zellerbach and Friends of the Oldman River Society.

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  • Article

    Onion

    The onion (Allium cepa), is a biennial, herbaceous plant of the Amaryllidaceae family. It is Canada's most important condiment crop. (Multiplier Onion) and A.

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  • Article

    Opossum

    The Virginia opossum (Didelphis virginiana) is Canada’s only marsupial. It belongs to one of three marsupial families native to the Americas. The Virginia opossum’s northernmost range reaches into Southern and Southeastern Ontario, Southern Quebec and the lower Fraser Valley in British Columbia. However, this range is slowly expanding north, likely due to climate change.

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  • Article

    Orchid

    Calypso bulbosa has similar but smaller, delicate pink flowers. Some Spiranthes and Habenaria species have small, whitish, fragrant flowers in a spike. Two genera, Eburophyton (plant is white) and Corallorhiza (plant is yellow to purple), live on decaying vegetable matter.

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  • Article

    Organic Agriculture

    Organic agriculture is defined as the sustainable cultivation of land for food production that nourishes soil life, nurtures animals in their natural environment and feeds them according to their physiology.

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  • Article

    Oriole

       Oriole is the common name for members of 2 families of birds. The Old World family Oriolidae occurs from Europe through Africa and Asia to Australia. 

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  • Article

    Osprey

    The osprey (Pandion haliaetus) is a large, cosmopolitan bird of prey characterized by a crested head and contrasting black, white and grey plumage. The osprey is the provincial bird of Nova Scotia. 

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  • Article

    River Otter

    The river otter (Lutra canadensis) occurs throughout North America except in desert and arid tundra regions. In Canada, it is scarce, except along the BC coast, where it is abundant and often wrongly identified as a sea otter. 

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  • Macleans

    Our Dying Seas

    This article was originally published in Maclean’s magazine on October 5, 1998. Partner content is not updated.

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  • Article

    Owl

    The owl (order Strigiformes) is an efficient, carnivorous, nocturnal bird of prey.

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  • Article

    Oyster

    Oyster is a common name for bivalve (hinged shell) molluscs, including true oysters (order Ostreoida) and tropical pearl oysters (order Pterioida), found chiefly in temperate and warm shallow waters.

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  • Article

    Ozone Depletion

    Ozone depletion is a chemical thinning of the OZONE LAYER in the stratosphere or upper atmosphere. Scientists determined in the 1970s that it is caused by ozone depleting substances (ODSs), particularly by the use of chlorofluorocarbons (CFCs).

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  • Article

    Ozone Layer

    The development of the ozone layer is thought to have been a significant factor permitting the evolution of life on Earth. Ozone is the main atmospheric gas that absorbs the biologically damaging part of the sun's ultraviolet radiation (UV radiation), known as UV-B (ultraviolet-biologically active).

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  • Article

    Pacific Salmon

    Pacific salmon include seven species of fish belonging to the genus Oncorhynchus, family Salmonidae. Two are native to Japan (O. masou and O. rhodurus); five to Canada, pink (O. gorbuscha), chum (O. keta), sockeye ( O. nerka), coho (O. kisutch) and chinook (O. tshawytscha). The genus name refers to the hooked snout characteristic of most spawning males. The native range of Pacific salmon includes the north Pacific Ocean, Bering Strait, southwestern Beaufort Sea and surrounding fresh waters. They occur in an estimated 1,300–1,500 rivers and streams in BC, notably the Skeena River and Nass River in the north; the Fraser River in the south accounts for about 75 per cent of the total salmon numbers. Pacific salmon are distinguished from other salmonids by their large number of anal fin rays (13–19). The Pacific salmon is the provincial fish of British Columbia. 

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  • Article

    Paintbrush

    The paintbrush is a herbaceous plant of genus Castilleja , figwort family, Scrophulariaceae. Most are perennial. The common name, Indian paintbrush, is applied to several species. About 200 species occur worldwide, mostly in

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