1)Streams and rivers are essential to the water cycle because water that falls to the ground drains into a larger body such as a stream or river, and the streams and rivers bring the water that falls to the ground into larger bodies of water where they are then evaporated and after it gets evaporated, it falls back to the ground and repeats the cycle again.
2)A river system is a river and all of its tributaries.
3)
Discharge- The amount of water passing through a certain point in the river in a given time.
Velocity- How fast the water is moving.
Channel-The path through which the water flows in a stream or river.
Gradient-The steepness of a riverbed.
4)The steeper the gradient, the faster the velocity would be because the steeper a slope, the faster things fall.
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