Basic+information.

=**Basic information. ** = Petroleum is a naturally formed, flammable liquid. Its recovered mostly through oil drilling. //Petroleum//, from Greek: //petra// (rock) + Latin: //oleum//(oil). Petroleum is also called Crude oil. It is a mixture of hydrocarbons of various molecular weights, that are found in geologic formations beneath the Earth's surface. Or beneath the sea.



It is used in many consumer products like petrol and [| kerosene.]

In its strictest sense, petroleum includes only crude oil, but in common usage it includes all liquid, gaseous, and solid (e.g., paraffin) hydrocarbons.