Which of the following is a feature that commonly forms where limestone has been dissolved?

A) sinkhole
B) karst topography
C) cave
D) all of these

Limestone

A sedimentary rock composed mainly of calcium carbonate (CaCO3), often formed from the skeletal fragments of marine organisms.

Karst Topography

A landscape formed from the dissolution of soluble rocks such as limestone, characterized by underground drainage systems and sinkholes.

Sinkhole

A depression or hole in the ground caused by the collapse of a surface layer, often due to the dissolution of the underlying limestone, volcanic activity, or water drainage.