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The crust. but if you are talking upwards, it is the troposphere. the word part "tropo-" could be related to the word "tropical," which contains much life. the word part "-sphere" could be related to the geometric shape, which is the shape of the earth, and surrounds it.

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14y ago
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6y ago

Soil

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Q: What is earth's top layer called that supports plant life?
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