1.
The beginning of a river.
2.
The end of a river, where it flows into the sea, a lake or another river.
3.
valley A narrow valley with steep sides formed by river erosion.
4.
erosion The wearing away or damage of land caused by human activities, such as building and walking.
5.
erosion The wearing away of the riverbed and riverbanks by moving water.
6.
erosion The wearing away of land when wind blows sand and small rocks against it.
7.
The wearing away or breaking down of rocks and land.
8.
The movement of rocks and sediment from one place to another.
9.
When transported material is dropped because the moving water, wind or ice loses energy.
10.
A raised area of sediment deposited along the sides of a river during a flood.
