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A naturally occurring thick brown liquid, composed of a mix of hydrocarbons, and usually found deep underground.
A naturally occurring thick brown liquid, composed of a mix of hydrocarbons, and usually found deep underground. It is formed by the action of heat and pressure on the remains of prehistoric plants and animals that built up on ancient sea beds and lakes. It is extracted by drilling, and is our main source of fuels, such as petrol, diesel and aviation fuel.
It is formed by the action of heat and pressure on the remains of prehistoric plants and animals that built up on ancient sea beds and lakes. It is extracted by drilling, and is our main source of fuels, such as petrol, diesel and aviation fuel.