Petroleum (or crude oil) is an essential raw material for modern life. According to the "Petroleum Engineering Overview" from the Career Cornerstone Organization, the United States consumes more than 840 million gallons of petroleum a year. It uses the raw components of crude oil for a wide variety of products: candles, fertilizer, food, ink, perfume, plastics, and soap. The transportation sector depends upon a petroleum base for making the asphalt for roads; airplanes, automobiles, mo...
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