Around 360 million years ago, before dinosaurs existed and the earth was covered in swamps ...
Coal
As they died organisms and tress fell to the bottom of these swamps and oceans where they decomposed. Over millions of years they were buried under layers upon layers of mud
Oil
Heat and pressure turned the dead plants and animals into fossil fuel. The type of fossil fuel produced depends upon, organic matter, time, temperature and pressure.
Natural Gas
Coal is formed from ferns trees and plants and heat and pressure
Rocks and dirt
Oil is formed from small organisms like zooplankton and algae and heat and pressure.
Sand and silt
oil deposits
Natural gas is also formed from these more complex matter but has more heat and pressure so decomposes more.
Sand and silt
Natural gas deposits
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