What are sinkholes? A. Holes that form at the bottom of the ocean
B. Holes that form in the ground when rocks and dirt are washed away under the surface

C. Holes that form near coastlines when the waves are very high
D. Small holes that form at the mouths of rivers and are hard to find

B

Explanation:

A sinkhole, also known as a cenote, sink, sink-hole, swallet, swallow hole, or doline, is a depression or hole in the ground caused by some form of collapse of the surface layer. Most are caused by karst processes – the chemical dissolution of carbonate rocks or suffosion processes.

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