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A waterfall is a place where water flows over a vertical drop or a series of drops in the course of a stream or river. Waterfalls also occur where meltwater drops over the edge of a tabular iceberg or ice shelf   A cascade of water falling from a height, formed when a river or stream flows over a precipice or steep incline.   Waterfalls often form in the upper stages of a river where it flows over different bands of rock. It erodes soft rock more quickly than hard rock and this may lead to the creation of a waterfall . Formation of a waterfall : The soft rock erodes more quickly, undercutting the hard rock.   Waterfalls keep falling because rivers and streams keep flowing. Rivers and streams collect water from a broad watershed. As long as it rains somewhere in that watershed occasionally, the river will keep flowing. If you have a bucket full of water and punch a hole near the bottom, the water will flow fast at first and gradually slow down as the l...