Question

why it is easy to swim in river water than in sea water
​

Answer 1

because river water is good while the sea water is salty

Answer 2

Due to high salt in the sea water the density of the sea water is higher as compared to river water. So as the density increases the buoyant force also increases. ... So the buoyant force is higher in the sea water as compared to river water. So it is easier to swim in the sea water as compared to the river water.

Hope it is helpful
And plz mark me brainlist