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| the envelope of gas that surround earth |
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| all living things on earth. |
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| a system that lets matter in or out. |
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| when matter goes in it stays |
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| one source of energy the earth uses is ? |
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| Earth can be thought of as consisting four major spheres. |
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| hydrosphere, atmosphere, geosphere, and biosphere. |
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| the three main parts of the geosphere are? |
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| the core, the mantle, and the crust. |
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| where does the biosphere extend from? |
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Definition
| the ocean floor upward for several kilometers into the atmosphere. |
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