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The layer of the earth that is composed of rock, yet flows due to extreme heat and pressure, is known as the _____.

crust
upper mantle
outer core
asthenosphere

2 Answers

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Earlier in the body of text you are reading, you should be able to find the fallowing passage: "Upper mantle: solid rock that flows due to plasticity."

Answer: Upper Mantle

User Peterboston
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It is the upper mantle.
User KinoP
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