Fuel oil
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Fuel oil is any of various fractions obtained from the distillation of petroleum. Such oils include distillates and residues. Fuel oils include heavy fuel oil, marine fuel oil (MFO), furnace oil (FO), gas oil (gasoil), heating oils, diesel fuel, and others.
An oil tanker taking on fuel, or "bunkering"
A fuel station in Zigui County on the Yangtze River
Fuel oil truck making a delivery in North Carolina, 1945
A sample of residual fuel oil
Petroleum
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Petroleum or crude oil, also referred to as simply oil, is a naturally occurring yellowish-black liquid mixture of mainly hydrocarbons, and is found in geological formations. The name petroleum covers both naturally occurring unprocessed crude oil and petroleum products that consist of refined crude oil.
A sample of petroleum
Pumpjack pumping an oil well near Lubbock, Texas, U.S.
An oil refinery in Ahmadi Governorate in Kuwait
A fractional distillation apparatus