Question

Caves are formed by the actions of

a. acid rain
b. plant roots
c. river water
d. groundwater

Answer 1

Best answer is D) groundwater

Caves generally form by the slow (very very slow) dissolution of soluble rock, such as limestone, which is dissolved by the acid in groundwater. Stalagmites and stalactites are evidence of this very slow dissolution process. 

Answer 2

Ground water is your answer.

Hope this helps....