Regions of North America

Lacking moisture, especially having insufficient rainfall to support trees or woody plants: an arid climate.

The usual pattern of weather conditions in a region, such as temperature, precipitation, and wind.

Sharing an edge or boundary; touching.

One of the main land masses of Earth: Africa, Antarctica, Asia, Australia, Europe, North America, and South America.

A line showing where North American waters drain either toward the Pacific or toward the Atlantic Oceans.

The height above a defined point, such as sea level.

The totality of the natural world, often excluding humans.

Natural processes that wear away material from Earth’s surface.

A large area of a sea or ocean partially enclosed by land.

The way people use and change the natural environment.