Question

Hydraulic action is a type of erosion caused by

Answer 1

Hydraulic action is the erosion that occurs when the motion of water against a rock surface produces mechanical weathering. Most generally, it is the ability of moving water to dislodge and transport rock particles.
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Answer 2

Answer:The erosive materials which get expose to water flow come under the direct action of water.Such water action is known as hydraulic action.

Explanation: Hydraulic action is mainly caused by the sea waves, which mainly used to erode the basin surface and causes the soil and rocks to loosen and move to a new place.