n. water falling to Earth's surface as rain, hail, snow, or sleet

n. an area of land where evaporation has left a layer of salt.

n. natural or human processes that turn fertile land into a desert.

n. a scientist who studies weather patterns over time.

adj. describing areas with little precipitation, but with enough moisture to support the growth of grasses, shrubs, and a few scattered trees.

n. a type of plant with pointed leaves, a long stem, and white flowers that grows in the Mojave Desert.

n. the process by which a liquid changes to a vapor or gas.

adj. relating to a geographic pole or the area around it.

n. the landforms of a piece of land.