Fact 1: Coal is used to produce electricity by burning in coal-fire power stations.

Fact 2: Like coal, petroleum is a fossil fuel.

Given the two facts above, answer the question "What are used to produce energy by burning?" with the following options: 
- fossil fuels
 - cigarettes
 - organic molecules
 - Firecrackers
 - carbon dioxide
 - atoms
 - dust
 - batteries


 

 fossil fuels        