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Fossils are formed from the buried remains of marine organisms. These organisms are under a tremendous amount of pressure and, over time, they fossilize.
No, it is formed when forests die and are covered with layers of rock which compress it and over time turns it into coal. Buried remains of marine organisms formed oil, following mass extinctions,where the oceans have stagnated.
The type of rock formed when exposed to extreme temperatures and pressure is metamorphic rock.
coal
Slate forms from shale under pressure.
Is natural gas formed by animal or plant remains
gneiss
Through the process of subsidence materials, in this case plant remains are literally buried. They do not start out as hydrocarbons, but are formed through moderate heat, pressure and chemical changes.
oil
Natural gas is an eco-friendly and efficient energy source. It is formed when layers of buried plants and animals are exposed to extreme heat and pressure over a long period of time.
Coal
Crude oil comes from these remains but it takes a very long time for them to form.