Definition for rivers and streams

A river is a natural flow of running water that follows as well-defined ,permanent path usually within a valley.

A stream is natural flow of water that follows a more temporary path that is usually not in a valley

Answer;

river  and streams are types of open channels i.e. conducts of water with a free surface in contrast to canals, ditches and adequate. river and streams are the products of natural geological processes and as a consequences are quite irregular.

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