geography- Rivers

Changes in the rivers and their valleys 

What is a drainage basin? 

the area of land drained by a river.

source- the start of the river

tributary-  a small stream joins a larger river 

watershed- the edge of a river basin

mouth- the end of a river usually where it joins a sea. 

how  does a rivers long profile change?

The long profile of a river shows changes in the height of the course of a …