Volcanism can cause both uplift and subsidence: uplift in areas of deposition of new volcanic rocks,and subsidence over the empty magma chamber.

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Volcanism can cause uplift in areas where new volcanic rocks are deposited, as these rocks can be less dense than the surrounding rocks and push the surface upwards. However, it can also cause subsidence over the empty magma chamber, as the removal of magma can cause the overlying rock to collapse into the resulting void.

Volcanism Can Cause Both Uplift and Subsidence: Uplift in Areas