• What is the relationship between the mantle and the asthenosphere? 
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• a. The mantle lies below a smaller layer called the asthenosphere. 
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• b. The mantle lies on top of a smaller layer called the asthenosphere.
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• c. All of the mantle is contained within a larger layer called the asthenosphere. 
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• d. All of the asthenosphere is contained within a larger layer called the mantle.