Which term does not describe a conversion between states of matter?

Mixing does not describe a conversion between states of matter. If you mix something, you are combining two substances, but they remain a solid, a liquid, or a gas. The state of matter does not change, even though the chemical composition may actually change.

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The  asthenosphere  is now thought to play a critical role in the movement of plates across the face of earth's surface. according to plate tectonic theory, the lithosphere consists of a relatively small number of very large slabs of rocky material.