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The Mantle of the Earth is the thickest layer, and while solid, contains elements that cause it to be pliable and flowing due to extreme heat and pressure. It undergoes motions similar to boiling water, known as convection. Convection of the mantle is expressed at the surface through the motions of tectonic plates.

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14y ago
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Q: What interior layer allows the earth's rigid outer shell to move?
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