Which of the following have the least density?

Sea water

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Ocean water

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River water

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Salty water

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Solution

The correct option is C
River water

Unlike river water, sea water, ocean water and salty water have lots of salts dissolved in it. So, they are all denser than river water. Therefore, it is easier to swim in sea water than in river water.

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Similar questions

Give reasons.

(i) Ocean water is salty.

(ii) The quality of water is deteriorating.

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