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conservation
The preservation, protection, or efficient using of natural resources.

natural resources
Any natural material that is used by humans.

renewable resource
A natural resource that can be replaced at the same rate at which the resource is consumed.

nonrenewable resource
A resource that forms at a rate that is much slower than the rate at which it is consumed.

biomass
Organic matter (once living organisms) that can be a source of energy.

geothermal energy
The energy produced by heat within the Earth.

fossil fuels
A nonrenewable energy resource formed from the remains of organisms that lived long ago.

uranium
A silvery-white metal that is radioactive and used to generate nuclear power.

solar energy
The energy received by the Earth from the sun in the form of radiation (transmission of energy through waves or particles through space).

wind energy
The use of air flow through wind turbines to mechanically power generators for electric power.

hydroelectric energy
Electrical energy generated by falling water.

tidal energy
A form of hydropower that converts the energy obtained from tides into useful forms of power, mainly electricity.

nuclear energy
The energy released by a fission or fusion reaction; the binding energy of the atomic nucleus.

petroleum
A liquid mixture of complex hydrocarbon compounds; used wisely as a fuel source.

alternative energy
Any energy source that is an alternative to fossil fuel.