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A depression in the ground due to a cave collapse or acidic water dissolution of limestone is called a

A. stalagmite.
B. cave.
C. stalactite.
D. sinkhole.

1 Answer

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This would be called a D. Sinkhole. Sinkholes occur because groundwater washes and deteriorates at limestone under the surface. This leads to underground gaps. Once the pressure becomes high enough, the sinkhole collapse from gravity leaving a dent similar to potholes in the road.
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