File Scrub 1 ::::: EKGames ... quiz
5. Coal, petroleum, natural gas, and propane are fossil fuels. They are called fossil fuels because:
- they are burned to release energy and they cause air pollution
- they were formed from the buried remains of plants and tiny animals that lived hundred of millions of years ago
- they are nonrenewable and will run out
- they are mixed with fossils to provide energy
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