Changes in the slope the river flows acrosswater can begin or end the life of a river. Hence, the correct answer is the slope the river flows across water. Read below about river flow.
What is a river flow?
A current in a river is the flow of water influenced by gravity as the water moves downhill to reduce its potential energy. The current varies spatially as well as temporally within the stream, dependent upon the flow volume of water, stream gradient, and channel geometry.
Therefore, the correct answer is as given above. When a river flows, it begin at its source and also where it stops determines its end.
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