Learn how Rivers Form in this educational video from dizzo95.
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Male Speaker: A river is born at its source when underground springs reach the earth surface and join rain water and melted snow that have collected into streams; all these streams flowing into the new river are called tributaries. Rivers erode the rock over which they flow initially cutting down and creating a winding valley. The rivers banks are typically steep and V-shaped. When the river flows over hard rock on to soft rock. The softer rock wears away, ultimately creating a waterfall. As the river reaches flatter land it flows more slowly and creates wider loops called meanders. Sometimes the river breaks through a meander and often leaves the stranded loop called an oxbow lake as it straightens. Finally the river flows into the sea at the mouth of the river, here it drops the sand, mud and eroded particles of rock or load which it is carried sometimes forming a wide flat and generally fertile extension of land called a delta.