Homepage
KidzSearch
Play Fun Mobile Games.
Games
Cool Videos for Kids.
Videos
Talk About Anything
Q&A
Social Network for Kids
KidzNet
Explore Popular Images.
Pics
Explore the Best Sites for Kids.
Websites
Listen to Streaming Music for Kids.
Radio
Facts for Kids.
Facts
Read About Cool Topics.
News
Browse Over 200,000 Student Articles.
Wiki
Learn How to Search with Boolify.
Boolify
Discover KidzSearch Apps
Apps
Fossil fuels are fuels that come from old life forms that decomposed over a long period of time. The three most important fossil fuels are coal, petroleum, and natural gas.
Petroleum and gas are hydrocarbons (molecules that have only hydrogen and carbon in them). Coal is mostly carbon. These fuels are called fossil fuels because they are dug up from underground. Coal mining digs up solid fuel; gas and oil wells bring up liquid fuel. Fossil fuel was not much used until the Middle Ages. Coal became the main kind of fuel with the Industrial Revolution.
view more...