The document discusses fossil fuels, including their formation, types, and uses. The three main types of fossil fuels are coal, oil, and natural gas. Coal forms from peat deposits over millions of years. Oil forms from the remains of ancient plants and animals. Natural gas forms near oil deposits and is composed primarily of methane. Fossil fuels are used widely as sources of energy, with coal and oil powering power stations and fueling vehicles, and natural gas used commercially and residentially. The document also describes two major oil spill incidents: the Exxon Valdez spill in Alaska in 1989 and the Deepwater Horizon spill in the Gulf of Mexico in 2010.