Browse "Nature & Geography"

Displaying 451-465 of 933 results

  • Article

    Ice-Worm

    Ice-Worm is a common name for Mesenchytraeus solifugus, a dark-pigmented oligochaete worm (see Annelida) up to 4 cm long, found in tangled masses in the melting ice of glaciers in the Pacific Northwest.

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  • Article

    Iceberg

    An iceberg is a piece of ice that has become detached from its parent glacier by a process known as calving.

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  • Article

    Igneous Rock

    Early formed, dense crystals may separate from the magma, causing a change in the composition of the residual melt.

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  • Article

    Meteors, Meteorites and Impact Craters

    The solar system contains many objects smaller than the planets (or their satellites) travelling in individual orbits about the SUN; space between the planets also contains myriad dust grains in the micron size range. Near Earth, dust concentrations are only a few hundred particles per cubic kilometre, but 35 000 to 100 000 t of extraterrestrial material enters the atmosphere annually, swept up by our planet from debris that is in its path or crosses its path. 

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  • Article

    Ghost Pipe

    Ghost Pipe (Monotropa uniflora), a perennial plant, is the only native species of genus Monotropa found in Canada.

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  • Article

    Indian Summer

    Indian Summer, popular expression for a period of mild, summerlike weather which occurs in the autumn, usually after the first frost. The origins of the name are obscure, but it was in use early in the 19th century in Canada and even earlier in the US.

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  • Article

    Insect

    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.

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  • Article

    Insect Classification

    A classification system acts as an efficient storage mechanism for information about each taxon or group.

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  • Article

    Insectivora

    Insectivora, order of mammals containing 7 living families: shrews, moles, hedgehogs, tenrecs, otter shrews, golden moles and solenodons. 

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  • Macleans

    Inside the Kyoto Deal

    Alberta’s energy minister, Steve West, spent much of last week wearing a tight smile, his clenched jaw and square shoulders set as firmly as his conviction that people who blame the oilpatch for the next century’s foul weather have lost their heads.This article was originally published in Maclean's Magazine on December 22, 1997

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  • Article

    Invertebrate

    Invertebrates are animals without a vertebral column (backbone). As a group, invertebrates are extremely diverse.

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  • Article

    Invertebrates: Table

    Invertebrates Phylum Species Habitat Examples Cnidaria 9000 mainly marine sea anemone, hydra, coral, jellyfish Ctenophora 50 marine plankton comb jelly, sea gooseberry Platyhelinthes 12 700 mainly parasitic flatworm, fluke, tapeworm Nemertea 600 mainly marine ribbon worm Acanthocephala 500 parasitic spiny-headed worm Rotifera 1800 marine and fresh water wheel animal Nematoda 10 000 all, many parasitic round worm Brachiopoda 280 marine, benthos & intertidal lampshell Bryozoa 4000 aquatic moss animal Pogonophora 80 deep-sea benthos beard worm...

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  • Article

    Irish Moss

    Irish moss is a type of seaweed that is commercially harvested in Canada’s Maritime provinces. It is mainly composed of carrageenan, a gelatinous substance. Carrageenan extracted from Irish moss is used as a thickening and gelling agent in foods and other products. It is also used to clarify beverages such as beer.

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  • Article

    Iron Ore

    Its most important mineral forms are magnetite (Fe3O4, 72.4% Fe), hematite (Fe2O3, 69.9% Fe) and siderite (FeCO3, 48.29% Fe). In Brazil, some ore that contains practically no other minerals can grade as high as 68% Fe, but the crude ore mined in Canada grades between 30 and 44% Fe.

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  • Article

    Jaeger

    The Jaeger is any of 3 species of rapacious, gull-like seabirds of genus Stercorarius. 

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