5. Coal, petroleum, natural gas, and propane are fossil fuels. They are called fossil fuels because:

    a) they are burned to release energy and they cause air pollution

    b) they were formed from the buried remains of plants and tiny animals that lived hundred of millions of years ago

    c) they are nonrenewable and will run out

    d) they are mixed with fossils to provide energy

Find the answer first or look at the Quick Answer List.

Return to the Energy Quiz Page, or
go to the next question.