Chapter 12 Fossil Fuel Notes -...
Transcript of Chapter 12 Fossil Fuel Notes -...
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Chapter 12 Fossil Fuel Notes
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a solid fuel formed from the remains of trees, ferns, and other plant materials that were preserved 280-360 million years ago
Coal
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Four types of coal ranked from lesser to greater age, exposure to pressure, and energy content. Lignite sub-bituminous Bituminous Anthracite
Coal
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Advantages Disadvantages
Energy-dense and abundant
impurities are released into the air when burned
Needs little refining Contains trace metals like mercury, lead, and arsenic
Easy to exploit, handle and transport
Carbon is released into the atmosphere which contributes to climate change
Technological demands are small
Combustion leads to increased levels of sulfur dioxide and other air pollutants
Low economic costs Ash is left behind
Advantages & Disadvantages
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A mixture of hydrocarbons, water, and sulfur that occurs in underground deposits
Formed from the remains of ocean-dwelling phytoplankton that died 50-150 million years ago
Petroleum
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Petroleum
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Advantages Disadvantages Convenient to transport and use
Releases carbon dioxide into atmosphere
Relatively energy-dense
Possibility of leaks when extracted and transported
Cleaner-burning than coal
Releases sulfur, mercury, lead, and arsenic into the atmosphere when burned Complex and dangerous to refine
Advantages & Disadvantages
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Exists as a component of petroleum as well as in gaseous deposits separate from petroleum
Contains 80 to 95 percent methane and 5 to 20 percent ethane, propane, and butane.
Natural Gas
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Advantages Disadvantages Contains fewer impurities and emits almost no sulfur dioxide or particulates
When unburned, methane escapes into the atmosphere
Emits only 60% as much carbon dioxide as coal
Exploration of natural gas has the potential of contaminating groundwater
Advantages & Disadvantages
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Oil sands- slow-flowing, viscous deposits of bitumen mixed with sand, water, and clay
Bitumen (tar or pitch)- a degraded petroleum that forms when it moves close to the surface, where bacteria metabolize some hydrocarbons and others evaporate.
Other Fossil Fuels
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Advantages Disadvantages Extends our petroleum supply
Takes more energy, water and money to extract Energy obtained is less efficient and releases more CO2 Mining of it disturbs the land (surface/strip)
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shows the point at which world oil production would reach a maximum and the point at which we would run out of oil
The Hubbert Curve
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If current global use continues, we will run out of conventional oil in less than 40 years.
Coal supplies will last for at least 200 years, and probably much longer.
The Future of Fossil Fuel Use