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If Earth's interior cooled significantly enough to halt plate tectonics, the rock cycle would be severely disrupted. Without plate motions, processes such as volcanic activity, subduction, and mountain building would cease, leading to a stagnation of geological processes. Over time, weathering and erosion would continue to break down surface rocks, but without new rock formation from tectonic activity, the planet's surface would become increasingly stable and less dynamic. Ultimately, Earth’s geology would reach a state of equilibrium, with fewer changes over geological timescales.

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2mo ago

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