A river starts at aplace called it's source. This could be an underwater spring or a melting glacier.
Head is where it starts and the mouth is where it lets out into a body of water like a lake or ocean. The HEAD of river is the place where the water spends 50% of time flowing downriver, and 50% time flowing up river. This is relevant to a tidal river.
Flowing water has kinetic energy
A source is the beginning of a river or water way and a mouth is the end of that river or body of water!
Rio Grande in the USA, Rhine flowing through Europe for starters.
the large body of water that flows across the land is a river.
a river
a river
The Amazon River.
a river
He watched her silky, red hair flowing in the wind.The water is flowing down the river.
The two effects produced by flowing water in a river are erosion, and a land formation known as a delta.
a river