Chapter 19 and 20 terms

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Fossil fuels

remains of organisms from past geological ages

electricity

a secondary form of energy is easy to transfer

Fossil fuels use what percent of us energy demand

82

net energy

the difference betweene energy returned and invested

Anaerobic decomposition

organic material broken down with little air

organic material broken down with air

coal

most abundant fossil fuel

peat

organic material that is broken down anaerobically

crude oil

sludge like mixture of different types of hydrocarbon molecules

natural gas

methan and other volatile hydrocarbons

kerogen

source material for both crud oil and natural gas

Thermogenic gas

methane and other gases that aris from kerogen