Biomass		The process by which a nucleus splits into two or more fragment and releases neutrons and energy.
Energy resource		Electrical energy produced by the flow of water.
Fission		A natural resource that humans use to make objects or to consume as food or drink.
Fossil fuel		A natural resource that humans use to generate electricity.
Geothermal energy		A non renewable energy resource formed from the remains of organisms that lived long ago.
Hydroelectric energy		The energy released by a fission or fusion reaction.
Material resource		The energy received by Earth from the sun in the form of radiation.
Natural resource		A natural resource that can be replaced at the same rate at which the resource is consumed.
Nonrenwable resource		The energy produced by heat within earth.
Nuclear energy		Any natural materials that is used by humans, such as water, petroleum, minerals, forests, and animals.
Renewable resource		A resource that forms at a rate that is much slower than the rate at which the resource is consumed.
Solar energy		Plant materials, manure, or any other organic matter that is used as an energy source.
Wind energy		The use of the force of moving air to drive an electric generator.