Question

give an example from our daily life where the processes of sedimentation and decantation are used

Answer 1

suppose if there is a beaker full of water and some salt put in it. Then you will wait for the sand to settle down (sedimentation). then when the salt has settled down then pour the water into another beaker safely without disturbing the sediment (decantation)

Answer 2

In villages, people use river water which is generally contaminated with mud and sand. Hence, they use sedimentation and decantation to make the water fresh and usable.