Nature & Geography | The Canadian Encyclopedia

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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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    Oystercatcher

    Oystercatcher is a name given to 11 species of large shorebirds of the family Haematopodidae.

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    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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    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 7 species of fish belonging to the genus Oncorhynchus, family Salmonidae.

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    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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    Parsnip

    The parsnip (Pastinaca sativa) is a perennial plant grown as an annual vegetable crop and belonging to the Umbelliferae family.

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    Passenger Pigeon

    The passenger pigeon (Ectopistes migratorius) is extinct.

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    Pea

    Some pea cultivars are grown in gardens for their tender green pods as VEGETABLES, which are harvested at their early stage of development, and eaten raw or cooked. They are known as snowpeas, sugar peas or snap peas. In parts of Asia and Africa, tender pea foliage is harvested as vegetable.

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    Peach

    The peach (Prunus persica) is the most widely grown stone fruit. It is native to China and was introduced to Europe 2,000 years ago. Peaches are now grown in temperate zones, worldwide.

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  • Article

    Pear

    The pear (genus Pyrus) is a common name for over 20 species of fruit-bearing and ornamental trees of the rose family.

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    Peat

    Peat, living and partially decomposed organic matter, consists principally of decayed brown mosses, Sphagnum plants, sedges and other semiaquatic plant remains.

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    Pelican

    The Pelican family (Pelecanidae) consists of large water birds with long, flat bills, expandable throat pouches, and 4 toes connected by a web.

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  • Article

    Pepper

    Pepper (Capsicum annuum) is a perennial plant, cultivated as an annual and belonging to the nightshade family.

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