Browse "Nature & Geography"

Displaying 691-705 of 740 results

  • Article

    Tuna

    The tuna is a swift, elegant marine fish of class Actinopterygii, order Perciformes, family Scombridae (mackerels). 

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    https://d3d0lqu00lnqvz.cloudfront.net/media/media/6954bf65-e5dd-4309-b2be-fe3047da446d.jpg Tuna

  • Article

    Tungsten

    Tungsten (W), also called Wolfram, lapis ponderosus or Heavy Stone, is a silver-grey metallic element with the highest melting point of any metal (3410° C). Tungsten has a high density, high strength at elevated temperatures and extreme hardness.

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    https://thecanadianencyclopedia.ca/images/tce_placeholder.jpg?v=e9dca980c9bdb3aa11e832e7ea94f5d9 Tungsten

  • Article

    Tunnels

    Unlike other mountainous countries such as Switzerland, and despite its size, Canada is not distinguished by well-known tunnels.

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  • Article

    Turnip

    Turnip (Brassica rapa, Rapifera Group), biennial vegetable belonging to the Cruciferae family and grown in all provinces as a root crop.

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  • Article

    Tyrant Flycatchers in Canada

    Tyrant flycatchers (family Tyrannidae) are a large, diverse bird family present in the Americas. The name flycatcher also refers to some members of the family Muscicapidae and a few other birds.

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    https://d3d0lqu00lnqvz.cloudfront.net/tyrantflycatcher/eastern-phoebe.jpg Tyrant Flycatchers in Canada

  • Macleans

    Unfamiliar territory

    Author J.B. MacKinnon’s latest explores our ever-shrinking, increasingly unnatural worldThis article was originally published in Maclean's Magazine on March 3, 2014

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    https://thecanadianencyclopedia.ca/images/tce_placeholder.jpg?v=e9dca980c9bdb3aa11e832e7ea94f5d9 Unfamiliar territory

  • Article

    Uranium

    Uranium oxide was first identified in 1789 by M.H. Klaproth in the MINERAL pitchblende, but its distinctive property of radioactivity was discovered much later (1896) by Henri Becquerel.

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  • Article

    Urban Heat Island Effect

    The urban heat island effect is a phenomenon created by city infrastructure like buildings, roads and rooftops, which absorb heat from the sun and re-emit this heat back into the air. This can cause higher air temperatures in urban areas. While some 27 million Canadians are affected by the urban heat island effect, many Canadian cities are creating green spaces with plants and trees and passing new urban design policies to reduce the impact of the urban heat island effect.

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    https://d3d0lqu00lnqvz.cloudfront.net/urbanheatislandeffect/Downtown-Vancouver.jpg Urban Heat Island Effect

  • Article

    Vertebrate

    A vertebrate is a member of the phylum Chordata.

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  • Article

    Vetch

    Vetch species are in the genus Vicia, which includes about 150 species native to both the Old and New Worlds, especially the Mediterranean area. Only 3 are native to Canada, although 9 or so have been introduced.

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  • Article

    Violet

    The Violet is a family (Violaceae) of annual or perennial herbaceous plants widely distributed throughout temperate and tropical regions. Tropical species may reach tree size. Roughly 500 species of genera Viola (violets, pansies) and Hybanthus (green violets) alone occur worldwide.

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  • Article

    Vireo

    The vireo (Vireonidae) is a family of small, basically olive green, insectivorous and partly frugivorous songbirds with repetitive, persistent song.

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    https://thecanadianencyclopedia.ca/images/tce_placeholder.jpg?v=e9dca980c9bdb3aa11e832e7ea94f5d9 Vireo

  • Article

    Volcano

    A volcano is an opening in the crust of a planetary body through which liquid, gaseous or solid material is expelled; also, the structure formed by the eruption of this material. Most terrestrial volcanoes expel magma, a mixture of molten rock and dissolved gases (eg, water vapour, carbon dioxide, sulphur dioxide). The Earth's volcanic belts are located above zones of anomalously high temperature (700–1,400°C) where magma is produced by partial melting of solid material in the crust and upper mantle. These areas commonly occur along crustal plate margins at depths of 10–50 km (see plate tectonics). Basalt is the principal magma at diverging plate boundaries, such as oceanic spreading ridges; basalt, andesite, dacite, and rhyolite characterize volcanic arcs along converging plate margins. The relatively low density of magma causes it to rise through fractures into regions of lower pressure where dissolved gases expand and propel it toward the surface. Magma trapped in shallow reservoirs may solidify to form subvolcanic intrusions or may undergo chemical change before resuming its ascent. Evacuation of such reservoirs sometimes causes overlying rocks to collapse, leaving steep-walled, circular depressions (calderas). Groundwater heated by magma may discharge as hot mineral springs, as geysers or as fumaroles, or steam may escape in explosive bursts (phreatic eruptions) which commonly precede eruptions of magma. Magma reaching the surface may issue as molten lava or as solid, pyroclastic ejecta (bombs, blocks, lapilli, ash). 

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  • Article

    Vulture

    The vulture is a large, long-winged, bald-headed bird of prey, normally abundant in warmer latitudes. 

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  • Article

    Walnut

    Walnut (Juglans), genus of trees of the walnut family (Juglandaceae). The roughly 15 known species are widely dispersed through temperate and tropical regions.

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