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ppk ppk
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12 years ago
Discuss the three types of energy sources and give examples of each. 
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12 years ago
Renewable resources are those that will always be plentiful on a human time scale. This includes solar, wind, geothermal, and tidal energy, for instance. Other resources are renewable if we do not overharvest them. For example, trees for wood fuel and charcoal will always be plentiful if we do not log too many too rapidly, and if we allow regrowth to occur. Finally, there are nonrenewable sources of energy, primarily the fossil and nuclear fuels that we are extracting and using, and that are not being replaced. 
Biology!
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