This is a live wallpaper or screensaver Waterfall Long Exposure Live Wallpaper
A waterfall is an area of a river or stream where the water flows over a steep vertical drop, often landing in a plunge pool below. Erosion plays an important part in the formation of waterfalls. As a stream flows, it carries sediment that can erode the soft bed rock (limestone and sandstone) underneath. Eventually this cuts deep enough so that only harder rock, such as granite, remains. Waterfalls develop as the granite forms cliffs and ledges.
Waterfalls themselves also contribute to erosion. Stream velocity increases as it nears a waterfall, increasing the amount of erosion.
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