Black Gold is a term used to refer to PETROLEUM, OIL, and crude OIL. PETROLEUM is a naturally occurring, flammable liquid found in geological formations beneath the Earth's surface. OIL is a type of PETROLEUM that is used as fuel, lubricant, and raw material for many products. SMITH is a common surname derived from the Old English word 'smitan, ' meaning 'to smite or strike.' Crudeoil is a type of PETROLEUM that has not been refined and contains hydrocarbons and other impurities. Texas Tea is another name for crude OIL, referring to the state of Texas, which is one of the largest producers of crude OIL in the United States. Crudepetroleum is a term used to describe unrefined PETROLEUM, which is a mixture of hydrocarbons and other impurities.