how rivers erdode
hydraulic action- the power of water hitting the bank eroding it away.
corrosion-chemicals in the water wearing away banks.
attrition- the rocks in the water hitting eachother and become smaller
abrasion- rocks in the water hit eachother and break down into smaller particles.
source- the area in which a river begins.
mouth-where a river ends it journey,flowing into the sea or a lake.
tributary- a smaller river that joins a larger river.
confluence- the point at which two rivers join.
watershed- the boundary between two drainage basins marked by a ridge of high land.
drainage basin- the area which is drainged by a river and its tributary.
drainage density- the total lenght of all the streams in the basin divided by the total area of the basin.