substance made from petroleum or natural gas
soil that has been deposited from river (running) water
a flat-topped hill, smaller than a mesa
large-scale commercial farming
dry period in which little, if any, precipitation falls, often causing extensive damage to crops
the wearing away of the earth's surface by the movement of water, wind, ice, and gravity
a sunken area in a plateau found between mountain ranges
factories in Mexico that assemble parts made in the United States
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