Browse "Nature & Geography"

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Article

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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Article

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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Article

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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Article

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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Article

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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Article

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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Article

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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Article

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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Article

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.
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Weather Observations

Weather in Canada ranges from the extreme cold of the Arctic to tornadoes and other severe weather in the southern regions; from the storms and fog of the Atlantic to the dry heat and majestic thunderstorms of the prairies.
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Article

Weathering

Fragmented rock materials formed by mechanical weathering are normally larger than clay particles. These materials constitute major sources of sediment for later erosion, transportation and deposition under the impetus of gravity, wind, water or ice.
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Article

Weeds

Weeds are plants growing where humans do not want them.
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Article

Wetlands

Wetlands cover about 14 per cent of the land area of Canada, and are the natural habitat of over 600 species of plants, animals and insects. In addition to providing a home for these plants and animals, wetlands are an essential part of the environment because they prevent flooding, filter toxins, store groundwater and limit erosion. The most common wetland habitats are swamps, marshes, and bogs.
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List

Whale Species in Canada

Whale is the common name for large marine mammals of the order Cetartiodactyla (formerly Cetacea). They are subdivided into the Mysticeti, or baleen whales, and Odontoceti, or toothed whales. Smaller kinds of toothed whales are called dolphins or porpoises. Thirty-five whale species are found at least occasionally in Canadian waters — 9 species of baleen whales, and 26 species of toothed whales (mostly dolphins and porpoises). The commercial pursuit of whales was significant in early European exploration of Canada (see Whaling). Since the end of commercial whaling in Canada in 1972, whale watching has become popular. Whales found in Canada range in size from about 60 kg for the harbour porpoise to well over 100 tonnes for the blue whale, making it the largest animal ever known.
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Article

Wheat

Wheat is the common name for members of genus Triticum of the grass family (Gramineae) and for the cereal grains produced by these grasses.
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