Question

give reson it is easies to sinm in the saw water then river
water

Answer 1

HEY!!

HERE IS YOUR ANSWER  :-

The salts dissolved in sea water make it more dense than fresh water. This means you float higher, making it easier to swim. The Dead Sea in Israel is extremely salty which provides so much buoyancy that you don't have to swim on water.

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Answer 2

The density of sea water is more than river water because of presence of a number of salts dissolved in it. The average salinity of the oceans is 35gms per 1000ml of water. When the ship enters the sea, the water is no more the river fresh water but the saline sea water which is denser. As a result the weight of water displaced is now more than what it was previously when the ship was in river. The upthrust increases and the ship rises up.