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Answer: Petroleum is a naturally occurring liquid found beneath the earth’s surface that can be refined into fuel. Petroleum is a fossil fuel, meaning that it has been created by the decomposition of organic matter over millions of years. Petroleum is formed when large quantities of dead organisms–primarily zooplankton and algae–underneath sedimentary rock are subjected to intense heat and pressure.

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Given to industry; acting or working with diligence; sedulous: as, a person industrious in business.

Marked by industry; done with or characterized by diligence; busily pursued, performed, or employed: as, an industrious life; industrious researches.

Expert; clever; shrewd.

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