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It was the innermost layer; The troposphere is the first layer of the Earth's atmosphere, thus it is the innermost one of all.
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Answer:

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Explanation:

The troposphere forms the lowest level of the Earth's atmosphere, extending down to the surface of the Earth. This layer also features the heaviest weight of all Earth atmosphere layers, comprising approximately 75 percent of the total atmospheric weight. The troposphere varies in thickness and height around the world.