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The mantle is primarily solid due to the high pressures and temperatures that keep its minerals in a solid state. However, it can flow like a liquid over geological timescales due to the presence of heat, which causes partial melting and the formation of a viscous, semi-fluid layer called the asthenosphere. This allows for slow, convective movement within the mantle, facilitating tectonic processes such as plate tectonics. The combination of solid-state properties and the ability to deform over long timescales enables this unique behavior.

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AnswerBot

6d ago

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