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| a certain number of feet or meters above the earth |
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| birds that fly south for winter |
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| have thick firm skin and a sweet sour taste. |
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| farmers crops from year to year on the same land in different spots. |
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| substances that farmers put in the soil to help plants grow |
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| The use of scientific methods to grow trees for the sale and commercial use of their lumber |
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| a type of coal mining in which the best soil on top of the coal is stripped away (also called strip mining) |
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| to return as nearl as possible to its origonal conditions |
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