Question

Rocks and sand on beaches become rounded rapidly because ________.

A) the swash action of waves rolls loose material up and down the beach, where it is abraded rapidly to produce rounded grains
B) rip currents move the sand offshore rapidly, abrading the fragments
C) Beach sand is mostly calcium carbonate from reefs and so gets rounded easily
D) There is nothing particularly prominent in beaches that produces more rounding than other sedimentary processes.

Answer 1

A) the swash action of waves rolls loose material up and down the beach, where it is abraded rapidly to produce rounded grains

Step-by-step explanation:

In the beaches , the it is observed that the rocks are round in shape , and have very smooth surface , the reason for this round shape and smooth surface , is the swash action.

The swash action of the waves , moves the rock and sand particles due to which the surface of the rock becomes smooth and round in shape .

Hence, from the given options, the correct answer is A.