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I believe the answer is pressure, or else stress. The change is known as metamorphism when heat is involved (which it almost certainly is).

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12y ago
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10y ago

If the rock is in a river it gets smoothed.

Those would be the forces of gravity and self weight as well as in-situ stresses which may cause compression, tension or shear.

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12y ago

The answer is metamorphic change.

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9y ago

Stress

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12y ago

Weathering.

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Q: What is a force that changes a rocks shape or volume?
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