source - This is where a river begins, plunge pool - A dip at the base of a waterfall, caused by erosion, dam - A barrier constructed across a river to control the flow of water or raise the level of water, erosion - The wearing away and removal of rocks by rivers, gorge - A steep sided valley formed by a waterfall, waterfall - A sudden fall of water over a steep drop, V- shaped valley - Formed by erosion into the shape of a letter V, tributary - A smaller river that flows into a bigger one., rapids - A fast flowing, shallow and rocky part of a river, reservoir - A large lake used as a source of water supply, stream - A small river, watershed - Area that drains into a river,

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