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substance made from petroleum or natural gas

alluvial soil

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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