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
7. Propane is used instead of natural gas on many farms and in rural areas. Why is propane often used instead of natural gas?
11. Solar, biomass, geothermal, wind, and hydropower energy are all renewable sources of energy. They are called renewable because they
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