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| Is a group of parts that work together as a whole. |
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| The envelope of gases that forms Earths outermost layer |
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| Three main parts: a metal , and a core, a solid middle layer , and a rocky outer layer |
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| consists of alll the water in the form of ice on or in Earth: glaciers, snowfields, ice caps, ice sheets, sea ice, and frozen ground. |
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| The parts of Earth that contains living organisms make up Earths biosphere |
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