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Asphalt is a highly viscous liquid that occurs naturally in most crude petroleums. Asphalt can be separated from the other components in crude oil (such as naphtha, gasoline and diesel) by the process of fractional distillation, usually under vacuum conditions. Both tars and asphalts are classified as bitumens, a classification that includes all materials entirely soluble in carbon disulphide. Asphalt is commonly used in roofing shingles, and combined with mineral aggregate to make asphalt concrete for making roads. (definition from Wikipedia)
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