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petrochemical

substance made from petroleum or natural gas

alluvial soil

soil that has been deposited from river (running) water

butte

a flat-topped hill, smaller than a mesa

agribusiness

large-scale commercial farming

drought

dry period in which little, if any, precipitation falls, often causing extensive damage to crops

erosion

the wearing away of the earth's surface by the movement of water, wind, ice, and gravity

basin

a sunken area in a plateau found between mountain ranges

maquiladoras

factories in Mexico that assemble parts made in the United States

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