4. How does pressure changes break down rocks?

The physical breakdown of rock involves breaking rock down into smaller pieces through mechanical weathering processes. ... Pressure release -- when a rock that forms under great pressure is brought to the surface and overlying rock is eroded away, fractures will form parallel to the outer surface of the rock.

when a rock that forms under great pressure is brought to the surface and overlying rock is eroded away, fractures will form parallel to the outer surface of the rock.

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