Sinkholes usually form when the ground becomes wet and things sink into them after a big rainstorm.

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Quizplus · Accepted Answer

Sinkholes typically form due to the dissolution of soluble rocks such as limestone, dolomite, and gypsum, which can create underground voids. When the land surface collapses into these voids, a sinkhole is formed, not necessarily due to the ground becoming wet after a rainstorm, although heavy rain can trigger their collapse.

Sinkholes Usually Form When the Ground Becomes Wet and Things