The ____ rock is easy to erode, but the ____ rock is not. So, as the years go by a ____ develops. The ____ rushes over the ledge and erodes the soft rock, forming a ____. In time, the ledge ____ into the plunge pool, where the ____ speeds up ____. Steps 1-3 are repeated. The waterfall gradually ____ upstream, carving out a ____.

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