Browse "Nature & Geography"

Displaying 151-165 of 740 results

  • Article

    Clay

    Clay is the common name for a complex group of industrial MINERALS, each characterized by different mineralogy, occurrence and uses.

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  • Article

    Climate Change

    Climate change occurs when long-term weather patterns begin to shift. These periods of change have occurred throughout the Earth’s history over extended periods of time. However, since the Industrial Revolution the world has been warming at an unprecedented rate. Because of this, the current period of climate change is often referred to as “global warming.” Human activities that release heat-trapping greenhouse gases, such as the burning of fossil fuels, are largely responsible for this increased rate of change. The implications of this global increase in temperature are potentially disastrous and include extreme weather events, rising sea levels and loss of habitat for plants, animals and humans. In Canada, efforts to mitigate climate change include phasing-out coal-fired power plants in Ontario and instituting a carbon tax in British Columbia. This article is a full-length entry about climate change. For a plain-language summary, please see Climate Change (Plain-Language Summary).

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  • Macleans

    Climate Clues from Vancouver Island

    To the uninitiated, it looks no more exciting than a long, thin log of grey plasticene. But to scientists like Jeffrey Fox, a Texas geologist who oversaw its extraction last week from the bottom of a deep bay 16 km north of Victoria, the 9.This article was originally published in Maclean's Magazine on September 2, 1996

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  • Article

    Climate Severity

     Environment Canada devised the climate severity index to rate a locality's climate according to human comfort and well being. The index has a range from 1 to 100, with a score of 1 representing the least severe climate and 100 the most.

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  • Article

    Cloud

      Cloud, visible suspension in the atmosphere composed of tiny water droplets or ICE crystals from about one to a few hundred micrometres in diameter.

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  • Article

    Clover

    The "true" clovers (genus Trifolium) are herbaceous plants of the pea family Leguminosae or Fabaceae (see legume) and must be distinguished from bur clovers (Medicago) and sweet clovers (Melilotus) of the same family.

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  • Article

    Club-moss

    Club-moss, perennial, evergreen, coarsely mosslike plants belonging to the genera Diphasiastrum, Huperzia, Lycopodiella and Lycopodium of the club-moss family (Lycopodiaceae).

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  • Article

    Cnidaria

    Cnidaria, phylum of multicellular, radially symmetrical invertebrates (eg, hydroids, jellyfish, sea anemones, corals) dating to late Precambrian era (630-570 million years ago). 

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  • Article

    Cockroach

    Cockroach, swift-running, flattened, oval-shaped insect belonging to order Dictyoptera. 

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  • Article

    Cod in Canada

    Cod is the common name for fishes of the class Actinopterygii, order Gadiformes, family Gadidae. This family contains about 30 species of mostly bottom-living fishes found in cool seas. In Canada, about nine species occur in Atlantic waters, three in the Pacific and five in the Arctic. The family includes many important food fishes, e.g., Atlantic cod (Gadus morhua), haddock (genus Melanogrammus), pollock (Pollachius virens), Pacific cod (Gadus macrocephalus) and tomcods (genus Microgadus). Fishes recently removed from the family Gadidae include cusk, burbot, rocklings and lings (now family Lotidae) and hakes (now family Phycidae).

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  • Article

    Cold Places in Canada

    During the prolonged darkness of winter, the air over the huge snow- and ice-covered surfaces of Canada may stagnate for weeks, radiating heat to outer space.

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  • Article

    Columbia Icefield

    The Columbia Icefield is a mass of ice covering a high plateau between Mount Columbia (3747 m), the highest point in Alberta, and Mount Athabasca (3491 m), located between Banff and Jasper national parks, along the BC-Alberta border.

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  • Article

    Columbine

    Columbine, herbaceous plant (genus Aquilegia) of buttercup family (Ranunculaceae). The generic name derives from Latin aquila, "eagle," common name from Latin columba, "dove." 

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  • Article

    Columbium

    Columbium (Cb), or niobium, is a grey, ductile, tarnish-resistant and superconductive metal with a melting point of 2468°C. The name niobium (Nb) was officially adopted in 1951 by the International Union of Pure and Applied Chemistry, after 100 years of controversy.

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  • Article

    Comet

    Comet, astronomical body orbiting the SUN, which appears for a few weeks as a faint, luminous patch moving slowly, from night to night, relative to the background of stars. The comet may also have a luminous tail pointing away from the sun.

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