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15.3 Chemistry
Vocabulary Words
Question | Answer |
---|---|
nonrenewable energy resources | a source of energy that exists in limited quantities and, once used, cannot be replaced except over the course of millions of years |
fossil fuels | rich deposits of hydrocarbons formed underground from the remains of once-living organisms |
renewable energy resources | a source of energy that can be replaced in a relatively short period of time |
hydroelectric energy | energy obtained from flowing water |
solar energy | sunlight that is converted into usable energy |
geothermal energy | thermal energy beneath Earth's surface |
biomass energy | the chemical energy stored in living things |
hydrogen fuel cell | a cell that generates electricity from a controlled reaction between hydrogen and oxygen |
energy conservation | the practice of finding ways to use less energy or to use energy more efficiently |