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Fossil fuel - Wikipedia
A fossil fuel[a] is a flammable carbon compound- or hydrocarbon -containing material [2] formed naturally in the Earth's crust from the buried remains of prehistoric organisms (animals, plants or microplanktons), a process that occurs within geological formations.

Fossil fuel | Meaning, Types, & Uses | Britannica
Fossil fuel is a hydrocarbon-containing material of biological origin that can be burned for energy. Fossil fuels, which include coal, petroleum, and natural gas, supply the majority of all energy consumed in industrially developed countries.

Fossil Fuels - National Geographic Society
Coal, oil, and natural gas are examples of fossil fuels. Coal is a material usually found in sedimentary rock deposits where rock and dead plant and animal matter are piled up in layers. More than 50 percent of a piece of coal’s weight must be from fossilized plants.

Fossil - Department of Energy
Fossil energy sources, including oil, coal and natural gas, are non-renewable resources that formed when prehistoric plants and animals died and were gradually buried by layers of rock.

Fossil fuels - Our World in Data
This article presents the long-run and recent perspectives on coal, oil, and gas – how much countries produce and consume, where our fossil fuel reserves are, and what role the fuels play in our energy and electricity systems.

Fossil Fuel Examples and Uses - Science Notes and Projects
The big three examples of fossil fuels are coal, oil, and natural gas. Other fossil fuels derive from these three, such as kerosene, propane, and gasoline. Fossil fuels are natural fuels formed by the decomposition, heating, and pressurization of buried phytoplankton and zooplankton (not dinosaurs).

Introduction to Fossil Fuels - Understand Energy Learning Hub
The three fossil fuels are oil, natural gas, and coal. Fossil fuels are hydrocarbons formed from deeply-buried, dead organic material subject to high temperature and pressure for hundreds of millions of years. They are a depletable, non-renewable energy resource.