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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 |
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| A complete turn in 24 hours |
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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 tree and thorny bushes tropical grasslands |
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| Deserrt 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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