a large, level area that rises above the surrounding land; has at least one side with a steep slope
the height of land above sea level
a deep crack in Earth's surface
a river or stream that flows into a larger river
rich in the substances plants need to grow well
to supply with water through a ditch, pipe, channel, or sprinkler
a long period of little or no rain
a fertile place in a desert where there is water and vegetation
a region of tall grasses with scattered trees
a person who has no permanent, settled home and who instead moves from place to place
raising just enough crops to support one's family
a crop that is raised for sale
a system for producing, distributing, consuming, and owing goods and services
to add variety to; to expand a country's economy by increasing the variety of goods produced
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