glossery+geological+features+at+land+and+sea

__**Asthenosphere**__ **-thin layer of the earth below the lithosphere.**

__Canyons-__ A deep valley with steep sides, often with a stream flowing through it.
__ **﻿** __ __ **Continental Divide-** __ **The crest of the Rocky Mountians that separates water flowing to the west from water flowing north and east;also called the Great Divide.**

**__Lithosphere-__the outer layer of the earth.**

__Trenches-__ A long, narrow excavation in the ground, the eath from which is thrown up in front to serve as a shelter enemy fire or attack.


**__Tributaries-__ A stream that flows to a larger stream or other body of water**.