The intense heat energy that comes from Earth's interior.

Fuel made from living things.

Electricity produced by the kinetic energy of water moving over a waterfall.

Wood, leaves, and manure belong to a group of renewable energy sources called _________ fuels.

Energy from the sun is called________.

Petrochemicals are compounds that are made from the fossil fuel _______.

Sunlight, water, wind, nuclear power, biomass fuels, geothermal energy, and hydrogen are all ___________ energy sources.

The fastest-growing energy source in the world is _________energy.

Taking a bike ride instead of a car ride is practicing energy ________, which helps save fuel for the future.

The radioactive wastes produced by nuclear fission remain dangerous for __________of years.

Fossil Fuels are considered nonrenewable resources because they__________

Fossil fuels are energy rich because they contain________

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