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| The path one body makes as it circles around another body. |
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| A circular journey; 365 1/4 days. |
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| An imaginary line around which a planet spins. Earth's axis runs through its center from the North Pole to the South Pole. (tilt = 23 1/2 degrees) |
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| A complete turn in 24 hours. (24 time zones) |
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| Plants that grow in a region. |
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| An area of cold climate and low lying vegetation. 2 types of it: Alpine and Arctic |
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| The dense mass of leaves and branches forming the top layer of a forest. |
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| A flat grassy region, or open plain with scattered trees and thorny bushes. Tropical grasslands. |
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| Desert vegetation that needs little water. |
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| A tree that loses its leaves in the fall. |
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| a tree that produces cones that carry seeds. |
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| the condition of the air and sky from day to day |
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| water that falls to the ground as rain, sleet, hail, or snow |
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| how hot or cold the air is |
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| the average weather over many years |
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| an intense wind and rain storm that forms over oceans in the tropics |
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