fossil fuels

1. Soil and rocks
• Most rocks in Earth’s surface are covered with layers of soil , which is a mixture
of weathered rock , decayed animal and plants remains
• In some places it can take hundreds or thousands of years for soil to form.

2. How do fuels form?
• Fossil Fuel are formed over millions of years from the
remains of ancient organisms .
• So ,they are considered “non-renewable resources”

3. 1)The formation of coal began in ancient swamps.
When plants in those areas died they sank to the bottom of the swamp.
A thick layer of peat or decayed dead plants built up and this layer was
buried by layers of sand and other sediment

4. 2)After long time ,heat and pressure at the bottom of earth they
turn the plant to “Lignite “ or “Bituminous”
(soft coal).

5. 3)Extreme heat changes soft coal (bituminous coal)to hard coal
(anthracite) .
N.B: When soft coal burns more energy is produced than hard
coal

7. Oil and Natural gases
They are formed from remains of living organisms that were once alive in the
ocean.
They settle to Ocean floor and were buried by sand before completely decaying

8. Over millions of year pressure and heat turned the remains of these
organisms into oil and natural gas .

9. Can you figure out what is the main
difference between Coal and Natural gas ?