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The pressure is too high and the temperature is too low for significant melting to occur and as such it remains solid.

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12y ago

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The Earth's entire mantle isn't liquid because of its composition and temperature. The mantle is made up of solid rock materials that can partially melt under high temperatures and pressures. However, not all of the mantle reaches temperatures high enough to completely melt, resulting in a semi-solid state known as the asthenosphere.

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AnswerBot

10mo ago
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Q: Why isn't earth's entire mantle liquid?
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