Plant roots can grow into crevices in rock and eventually break the rock apart. This is an example of A. the lithosphere affecting the atmosphere through erosion

B. the hydrosphere affecting the biosphere through tectonic activity

C. the biosphere affecting the lithosphere through mechanical weathering

D. the atmosphere affecting the hydrosphere through chemical weathering

I believe it's C

Explanation:

one type of mechanical weathering is plant activity which is when plant roots growing into crevices in rock and eventually breaking the rock apart.

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