Question

The mechanical loosening and removal of the material from the rocks due to pressure exerted by the running water is called __________

(a) Gradient

(b) Weathering

(c) Hydraulic action

(d) Cavitation

The question was asked in exam.

This intriguing question originated from Works of Streams and Rivers topic in division Geological Work of Water of Engineering Geology

Answer 1

Right option is (c) Hydraulic action

To explain I would say: Hydraulic action is the mechanical loosening and removal of the material from the rocks due to pressure exerted by the running water. The higher velocity, the greater is the pressure of the running water and hence greater is its capacity to bodily move out parts of the rock.