Question

what are things which enter the oceans with the flow of river water

Answer 1

The oceans get saltier due to the rivers that flow into them. Water from the ocean evaporates, and then rains over land and forms rivers. As the rivers flow over the land, things like salt dissolve into the river and are carried out to the sea.

Answer 2

sand, rocks, polythene, cans, minerals, salt etc.
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