Browse "Nature & Geography"

Displaying 841-860 of 900 results
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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 eruption of this material.

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Vole

Vole, common name for several rodents of family Muridae, found only in the northern hemisphere.

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Vulture

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

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Walleye

Walleye (Stizostedion vitreum vitreum), moderately large, predatory freshwater fish of the family Percidae (order Perciformes).

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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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Walrus

The walrus is a tusked, fin-footed mammal. In Canada, the Atlantic walrus is found primarily along the northern coasts of Hudson Bay, Davis Strait, Foxe Basin and Baffin Bay.

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Wapiti

The Wapiti (Cervus canadensis) is the second largest (after the moose), most highly evolved Old World deer. It is also known as the American elk.

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Warbler

Warbler is a name applied to several groups of birds, primarily the New World wood warblers, and Old World warblers of which only 3 species commonly breed in Canada.

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Wasp

Wasp is a term applied to stinging insects in the division Aculeata of the order Hymenoptera, which also includes ants and bees.

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Water

Worldwide, over two-thirds of precipitation falling on land surfaces is evaporated and transpired back into the atmosphere. In Canada less than 40% is evaporated and transpired; the remainder, called the water yield, enters into streamflow.

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Water Lily

A large family of freshwater plants known as the water lily (Nymphaeaceae) is characterized by large, shield-shaped leaves and showy blossoms. They are mostly tropical or subtropical. Four genera and 9 species are native to Canada, of which 3 species are important.

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Water Pollution

Water pollution occurs when discharges of energy or materials degrade the quality of water for other users, including both humans and wildlife. Pollution can affect inland waters such as lakes, rivers and groundwater, as well as coastal marine waters.

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Waterfall

A waterfall is a phenomenon which occurs when water flowing in a river channel encounters a vertical or near-vertical drop in the channel bed.

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Waterfowl

Waterfowl is a general term used for members of the family Anatidae, composed of closely allied species commonly known as ducks, geese and swans.

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Waxwing

Waxwing is a family of birds comprising 8 species, including the true waxwings, the palmchat of Hispaniola and the silky-flycatchers of the southwestern US and Central America.

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Weasel

The weasel is a small, long-bodied, carnivorous mammal of the family Mustelidae. Three species of weasels are found in Canada: the short-tailed weasel, also known as the ermine or stoat (Mustela erminea), the long-tailed weasel (Mustela frenata), and the least weasel (Mustela nivalis). The least weasel is the smallest species in the order carnivora. The genus Mustela also includes mink, black-footed ferret, and the introduced European ferret.

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Weather

WEATHER FORECASTING is the attempt to understand atmospheric patterns to predict the weather conditions that will occur at a specific place and time, including temperature, wind, cloud, precipitation and humidity.

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Weather Forecasting

Most modern meteorologists attempt to cope with physical processes by expressing them mathematically, ie, by creating mathematical models of the atmosphere. Powerful computers are then used to solve problems.

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Weather Modification

Weather modification has been used in an attempt to increase rainfall and snowfall, to suppress hail, to clear fogs, to modify tropical cyclones and to suppress lightning. The term "weather modification" is not normally used to describe inadvertent changes in our WEATHER.