Which of the following are nonrenewable energy sources? (Select all that apply.)

___________ is used to produce 30% of the world's electricity.

Used to generate gasoline, jet fuel, and kerosene, ______ can be used to generate electricity or to power vehicles.

________________ is the cleanest of the fossil fuels. It is used to generate heat and electricity.

_________ energy is converted to electricity using photovoltaic cells.

A turbine turned by air currents describes how electricity is generated via _________ power.

_____________ power is generated by dams on rivers. The water flows through the dam turning a turbine that generates electricity.

_____________ energy is used to heat and cool buildings using the mostly constant temperature of the Earth several feet below the surface.

________________ are plants grown and then used to create energy. The plants are typically burned to make electricity, but certain plants can also make fuels such as ethanol or biodiesel.

What are the advantages of fossil fuels?

What is typically the biggest barrier to renewable energy resources?