Which type of fuel is a solid?

Which of these is used to make gasoline?

Which extremely flammable gas is most commonly burned for fuel?

Which one of these is nonrenewable?

Why is ethanol a renewable fuel?
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Fossil fuels are sources of energy made from what?

An electric car is NOT "green" if the electricity to charge it comes from ___________.

The team modified the ATV to run on what?
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Biodiesel can be made from what?

Which of these must be true to run a car engine?
