The Physical Geography of the United States and Canada
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Divide
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a high point or ridge that determines the direction rivers flow
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Headwaters
2
the sources of river waters
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Tributaries
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smaller streams and rivers that feed into a main river
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Fishery
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areas (freshwater or saltwater) in which fish or sea animals are caught
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Timberline
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elevation above which it is too cold for trees to grow
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Chinook
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a warm dry wind blowing down the eastern slopes of the Rockies
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Prairie
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a treeless grassy plain
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Supercell
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violent thunderstorms that can spawn tornadoes
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Hurricane
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a large, powerful windstorm that forms over warm ocean waters
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Blizzard
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a heavy snowstorm with winds of more than 35 miles per hour and reduced visibility of less than one-quarter mile