1) What is the start of a river called? a) source b) mouth c) confluence 2) What is the end of a river called? a) source b) tributary c) mouth 3) What is a river that joins another river called? a) watershed b) tributary c) mouth 4) what is the point where two rivers meet called? a) confluence b) watershed c) mouth 5) where on a river would you find a waterfall? a) middle b) upper c) lower 6) which is a form of erosion a) abrasion b) traction c) saltation 7) Deposition occurs when the velocity (speed) of a river ... a) increases b) decreases c) stays the same

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