Fossil fuels are______________.
____________ is pumped out of the ground and can be used for cooking and
heating our homes.
Which is not a fossil fuel?
A material that is formed from ancient organisms and is used today as a source of energy is a(n) ____________.
Which is an example of a nonrenewable resource?
Nonrenewable resources are resources that ___________.
What do humans use coal the most often for?