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| a major mountain system of the United States and Canada extending 3000 miles from Alaska south to New Mexico |
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| a section of a waterway with closed gates where water levels are raised or lowered, through which ships pass |
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| a group of five freshwater lakes of central north america between the united states and canada; the lakes are huron, ontario, michigan, erie, and superior |
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| a vast grassland of central north america that is largely treeless and ascends to 4000 feet above sea level |
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| permanently frozen ground |
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| canadas longest river, which is part of a river system that flows across the northwest terriories to the artic ocean |
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| north americas most important deep water ship route |
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| one of two major mountain chains in the eastern United States and Canada, extending 1600 miles from newfoundland south to Alabama |
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| winds that blow from east to west |
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| a northern part of the interior lowlands that is a rocky flat region covering nearly two million square miles and encircling hudson bay |
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