The sea water is the water in the ocean. If you once swum in the ocean and tasted it , you will know the sea water is bitter and salt. The salinity in the sea water comes from the rock on land. When the rock is corroded by rain and wind, the salinity will be washed away by the rain and flowed to the ocean. Therefore, the sea water become salty.
All year round, it is under high temperature around the equator. While the temperature around the South Pole and Arctic is very low. So, the low temperature iced up the water. The huge ice float on the water is called floe.
The ocean has the least salinity is the Atlantic Ocean because the Amazon pour millions of fresh water into the Atlantic everyday. That is the reason that the fresh water is not salt.
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