Why are volcanic rocks often exposed at Earth's surface as hills, ridges, and mountains surrounded by areas of lower elevation?

The correct answer is : They are more resistant to erosion.

Explanation:

Volcanic rocks are often more resistant to erosion than surrounding rock. Remember that these rocks are solidified on or near the surface. Due to they are created during fractional crystallization of magma before extrusion, they become stronger and more unaffected by the environment.