Question

ves are formed when
granite gets bigger
granite dissolves
limestone dissolves
limestone gets bigger

Explanation:

Caves are often formed by the dissolution of soluble rocks like limestone. Limestone can be dissolved by water containing carbon - dioxide, creating cavities and eventually caves. Granite is an igneous rock and is not easily dissolved in the process of cave - formation. Also, rocks do not "get bigger" in the context of cave - formation through natural processes relevant here.

Answer:

limestone dissolves