Now we are looking on the crossword clue: Crude subject.
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Possible Answers: OIL.
Random information on the term “OIL”:
Petroleum (L. petroleum, from Greek: πέτρα (rock) + Latin: oleum (oil)) is a naturally occurring, smelly, yellow-to-black liquid found in geologic formations beneath the Earth’s surface, which is commonly refined into various types of fuels. It consists of hydrocarbons of various molecular weights and other liquid organic compounds. The name petroleum covers both naturally occurring unprocessed crude oils and petroleum products that are made up of refined crude oil. A fossil fuel, petroleum is formed when large quantities of dead organisms, usually zooplankton and algae, are buried underneath sedimentary rock and undergo intense heat and pressure.
Taken from Wikipedia