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solar energy
sunlight that is converted into usable renewable energy
hydroelectric energy
renewable energy obtained from the movement of flowing water
geothermal energy
renewable energy derived from the heat in the interior of the earth
wind energy
renewable energy captured by transforming the motion of air into electrical energy using a turbine
biomass energy
energy created through the burning of biological materials, such as wood
tidal energy
renewable energy produced by the rise and fall of ocean levels; used to generate electricity
energy conservation
the practice of finding ways to use less energy or to use energy more efficiently
efficiency
the percentage of energy that is actually used to perform work
insulation
building material that blocks heat transfer between air inside and the air outside
renewable energy
a resource that has a theoretically unlimited supply and is not depleted when used by humans.
nonrenewable energy
a source of energy that has a finite supply capable of being exhausted.
fossil fuels
coal, oil, natural gas, and other fuels that are ancient remains of plants and animals.
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