Water erosion is most likely to form caves in a hilly region that is warm and
rainy due to increased dissolution of limestone along joints, fractures etc
thereby enlarging them and forming the caves.
Water which is warm and rainy increases the rate of the dissolution of the
limestone in rock particles. The water erodes the rock particles thereby
resulting in the enlargement.
The enlarged rocks from the limestone dissolution is what results in the
formation of caves.
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