Source, The starting point of a river., Erosion, When sand and rocks rub against the riverbed and wear it away., V-Shaped Valley, The shape a river carves into the land over time., Impermeable, A type of rock that does not let water pass through it., Glacier, A giant mass of ice that can be a source of a river., Plunge Pool, The deep hole at the bottom of a waterfall caused by swirling rocks.

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