Monday, 28 July 2014
A waterfall
is a place where water flows over a vertical drop in the course of a stream or
river. Waterfalls also occur where meltwater drops over the edge of a tabular iceberg
or ice shelf. Waterfalls are commonly formed when a river is young. At these
times the channel is often narrow and deep. When the river courses over
resistant bedrock, erosion happens slowly, while downstream the erosion occurs
more rapidly. As the watercourse increases its velocity at
the edge of the waterfall, it plucks material from the riverbed. Source
