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 would you find the watershed? a) high ground b) low ground c) on a tree 6) where on a river would you find a waterfall? a) middle b) upper c) lower

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