Which of the following is NOT an alternative energy source?

• fossil fuels
• geothermal
• hydroelectric
• wind 

Biofuel is...

•  Energy that comes from harnessing the movement of the air
• Energy that comes from the Sun
• A source of non- renewable energy
• Fuel from plant material

Hot water is pumped up from deep inside Earth and is used to heat homes or to generate electricity. This describes...

• biofuels
• hydroelectric energy
• geothermal energy
• hot water heating

As water flows through a dam, a generator is turned and creates enough electricity for thousands of homes. This describes...

• biofuels
• hydroelectric energy
• geothermal energy.
• potential energy

What are two advantages of geothermal energy?

• cheap and non-renewable
• expensive and heavy pollution
• cheap and little pollution
• cheap and does no harm to anything

Generators are used to produce electricity from all of these sources EXCEPT _____.

• solar
• wind
• tidal
• nuclear

One problem with ____ energy is that it produces radioactive waste. 

• nuclear
• solar
• tidal
• geothermal

Oil, natural gas and coal are called ________resources because they are not easy to replace.

• fossil fuels
• cheap
• natural resources
• nonrenewable

Which of the following is a fossil fuel?

• Wind
• Coal
• Solar
• Biomass

Which alternative energy source does this information describe?

• Hydroelectricity
• Solar energy
• Biofuels
• Wind