mushroom rocks
A sudden descent of water made by a river is a waterfall.
It is a waterfall.
It's a waterfall
It's a waterfall
rapids
Gravity.
it is called the hellow river
The Amazon River is called the "Ocean River" because we get about 20% of fresh water from there in the world!
the area from which water drains into a river is called the river's catchment. A river's watershed is the connecting ridges surrounding the watershed, and separating it from adjacent ones.
A river must have enough width and a flowing water to be called a river no matter how long it is.
water shed
Any river. The place where the river empties into the sea or lake is called the "mouth" of the river.