Because mountains, and the crust in general, float on the mantel. imagine a log and a piece of plywood floating in a pond; what causes the log to stick out of the water so much? It is that the crust is thicker that makes the mountain range, not the mountain range that makes the crust thicker.
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Because mountains, and the crust in general, float on the mantel. imagine a log and a piece of plywood floating in a pond; what causes the log to stick out of the water so much? It is that the crust is thicker that makes the mountain range, not the mountain range that makes the crust thicker.