What is the difference between a valley and a canyon?

A valley is a low area of land between hills or mountains, typically with a river or stream flowing through it. A canyon is a deep gorge, typically one with a river flowing through it.

The main difference is that a valley is a low area of land and a canyon has a very deep cleft between escarpments or cliffs resulting from weathering and the erosive activity of a river over geologic time scales.

Explanation:

20: 5

explanation:

about 20% of the world's population lives in   southwest asia, but on less than 5% of the world's   land area.