Describe the journey of a river from its source to its mouth.
The river takes birth in a mountain, becomes larger where it is meet by a number of tributaries, flows over plains and finally ends when it reaches the sea. In its early stage, it flows over steep mountains where its rate of erosion is maximum.
As the river enters into the plains, the volume of water increases and the slope of land decreases, resulting in slow speed of the river. Before meeting the sea, the river becomes large and sluggish and gets divided into several distributaries. It now comes to its old stage. The river, thus deposits silt, sand and sediments over a large area near its mouth.