Define the meaning of hydraulic action?

Question

Define the meaning of hydraulic action?

Answer 1

Hydraulic action is a form of mechanical weathering caused by the force of moving water currents rushing into a crack in the rockface. The water compresses the air in the crack. As the wave retreats, the highly pressurised air is suddenly released with explosive force, capable of chipping away the rockface over time. Thus, the crack is gradually widened so the amount of compressed air increases, and hence the explosive force of its release increases. Thus, the problem intensifies (a 'positive feedback' system).

Answer 2

How about this:

Fluid being pushed from a large space to a smaller space creating increased pressure which can be directed to produce motion.

Answer 3

Or this: Do your own homework

Answer 4

form of mechanical weathering caused by the force of moving water currents rushing into a crack in the rockface