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| the short-term changes in the air for a given place and time |
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| a region's average weather conditions over a long period |
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| winds that blow in the same direction over large areas of land |
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| large streams of surface seawater |
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| the place where two air masses of different temperatures or moisture content meet |
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| seasonal winds that bring either dry or moist air |
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| areas of tall grasses and scattered trees and shrubs |
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| semidry grasslands or prairies |
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| permanently frozen layers of soil |
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| a group of plants and animals that depend on each other for survival and the environment in which they live |
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| the place where a plant or animal lives |
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| decayed plant or animal matter |
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| the spread of desertlike conditions |
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| any material in nature that people use and value |
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| resources Earth naturally replaces |
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| resources that cannot be replaced |
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| planting trees to replace lost forestland |
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| nonrenewable resources that formed from the remains of ancient plants and animals |
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| production of electricity from waterpower |
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