steep, often jagged slopes or cliffs
- a long, narrow valley in Earth's crust where two continental plates are separating or between two faults.
narrow valley between hills or mountains
used for precision tools, cutting, grinding
long times with little or no rain
regions of dense forestation located mostly close to the equator
the umbrella-like part of a parachute that fills with air
The process of stripping the land of its trees
grassland with scattered trees; found in tropical regions of Africa, Australia, and South America
the process that turns fertile land into land that is too dry for life.
are plants such as cacti with thick,fleshy leves that conserve moisture.