# Volcanic heat from compression or just friction?

## Main Question or Discussion Point

The interior of the earth is hot enough to melt rock. Obviously friction plays a role.

But does compression also heat rock? If yes, what is the underlying chemical mechanism, perhaps an exothermous reaction, that heats rock?

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One must also consider tidal forces between the moon and earth. These gravitational forces also contribute to the heat inside the earth.

As another effect, albeit negligible, one must consider the decay of unstable isotopes, such as thos of uranium, radium, barium and many other trace elements.

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Any thoughts on how the compression heats rock? High compression should only mean molecules are closer together. Why would this make them vibrate more?

Any thoughts on how the compression heats rock? High compression should only mean molecules are closer together. Why would this make them vibrate more?
I am not sure as to the mechanics of how compression heats up rock or any other object, for that matter. I only know that it does, sorry for a thin answer. I'd suggest you post your compression question in classical physics, it will be answered easily there.

LURCH