a source of solar power a source of electrical power a source of renewable energy a source of nonrenewable energy
I gave my students this multiple choice question: It can take millions of years for fossil fuels to form. These fossil fuels form underground from decaying plants and animals. Which term best describes a fossil fuel?

Only one answer is correct among these 4 choices:
- a source of solar power
- a source of electrical power
- a source of renewable energy
- a source of nonrenewable energy

Could you tell me which one is correct?

a source of nonrenewable energy