The granite bedrock itself can indeed sink/rise, if you add/remove large amounts of weight on top. https://en.wikipedia.org/wiki/Isostatic_depression https://e

The granite bedrock itself can indeed sink/rise, if you add/remove large amounts of weight on top. https://en.wikipedia.org/wiki/Isostatic_depression https://en.wikipedia.org/wiki/Isostatic_depression https://en.wikipedia.org/wiki/Isostatic_rebound https://en.wikipedia.org/wiki/Isostatic_rebound