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Renewable Energy Sources
Can be replenished naturally, at or near rate of consumption & reused.
Nonrenewable Energy Sources
Exist in fixed amounts on earth & can't easily be replaced or regenerated.
Depletable renewables
Can run out if overused; Example: Biomass (wood, charcoal, ethanol).
Fossil Fuels
Fossilized remains of ancient biomass that take millions of years to form; Examples: Coal, Oil, Natural Gas.
Nuclear Energy
Energy generated from uranium or other radioactive fuels.
Nondepletable renewables
Do not run out if overused; Examples: Solar, wind, hydroelectric, geothermal.
Rate of Consumption
Rate of use must be at or below rate of regeneration for renewables.
Biomass
A renewable energy source that can be justified as such depending on its rate of use and regeneration.
Fossil fuels regeneration
Fossil fuels will run out because they take far longer to regenerate than the rate we use them.