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Fossil Fuels

This is my science homework on fossil fuels.
by

Emily Taylor

on 10 December 2012

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Transcript of Fossil Fuels

Emily Taylor 7V Fossil Fuels What are fossil fuels? Why didn't these plants and animals rot in the usual way? How are fossil fuels formed? Why are different fossil fuels formed and what do they have in them?


Fossil Fuels are the organic remains of prehistoric plants and animals. Coal, Oil and Gas are all types of fossil fuels. Different types of fossil fuels and how they look Natural gas, coal, and oil are the most common types of fossil fuels. They make up over seventy five percent of the energy used on Earth. How did those animals get their energy? They got natural energy, which comes from the sun. Their methods of receiving energy are not dissimilar to those which plants and animals use now. When did those animals live? The animals and plants lived in the carboniferous period, about 290-350 million years ago. They didn't rot away because they were secured between two pieces of rock or another similar material. This would have preserved them like fossils that you find on the beach, hence the name FOSSIL fuels. Fossil fuels are formed by the removal of water from peat. In the carboniferous period the land was mostly covered in swamps filled with large trees, ferns, and other leafy plants. As the trees and plants died, they sunk to the bottom of the swamp and formed spongy layers of materials called peat. Over hundreds of years, the peat was covered with sand, clay and other minerals, which formed a layer of rock called sedimentary. As more and more rock was piled on, it got heavier and the water was squeezed out. Eventually, over millions of years it became coal,oil or petroleum, and natural gas This is what they look like now... The sun: Bacteria causes the dead plants and animal remains to break down and decompose. Low temperatures were needed for the fossil fuels to form. Fossil fuels is found in sedimentary rock and metamorphic rock which is of sedimentary origin Like their name implies, fossil fuels are derived from organic material that was once part of a living thing. As organisms die and are buried in sediments, they are exposed to increasing pressures and temperatures that chemically alter them from animal remains into natural gas and oil. Without being buried, without changing pressures and changing temperatures, fossil fuels would not form. Hence, they are found in rock because animals die and become buried in sediment, which then becomes rock. What conditions were neccersary for this to happen and what role did bacteria play? Why are fossil fuels found buried in rock? What type of rock are fossil fuels found in? Coal Oil Natural Gas (Flame) Some fossil fuels are different because they contain different remains. For example, coal is the only fossil fuel that does not contain both plant and animal remains. Fossil fuels have animal and plant remains in them. Thank You for watching
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