Fossil fuels are natural fuels formed from the remains of ancient organisms. There are three main types: coal, oil, and gas. Coal is formed over millions of years when plant and animal remains are decomposed, turn to peat, and are compressed by layers of sediment into sedimentary rock. Oil and gas are formed similarly through decomposition of organisms on sea beds, which over millions of years compress and separate into oil or gas deposits trapped within rock formations.

2. What are Fossil Fuels?
 Fossil Fuels are natural fuels formed in
the geological past from the remains of
living organisms (decomposition).
 There are 3 types of fossil fuels.
 Coal
 Oil
 Gas.

3. Formation of Coal
• Plants & Animals died hundreds of millions of
years ago and decomposed. Decomposition
Layer of Peat • Begins to form from rotted vegetation.
• Covered by river with deposits of mud and sand.
River & Mud
and Sand
• Takes millions of years to compressed mud and
sand into sedimentary rocks.
• The peat hardened into Coal.
Coal

6. Formation of Oil & Gas
Decomposition • Plants & dead creatures decomposed.
• Collected on the layer on the Sea Bed.
Layer on Sea
Bed
• Each one rotted to form a tiny Spot of Oil.
• There remains were covered by mud and sand. Tiny Spot of Oil
• The sand compressed into hard sandstone rock.
• The Oil & Gas separated through the sandstone.
• The lighter Gas rises to the top.
Forming Oil &
Gas