Question

fossil fuels are made up of carbon - based molecules that have been compacted into a dense form, such as coal or oil. the piles of black coal at the power plant in the picture are used to generate electricity. as coal burns in the power plant, the molecules in the coal react with oxygen to produce carbon dioxide and water vapor. this reaction releases energy as heat. then, this heat energy moves a machine called a turbine, which spins a generator to create electricity. complete the sentence. when fossil fuels burn, much of the energy is in the form of , and carbon is in the form of .

Explanation:

1. From the text: "As coal burns... This reaction releases energy as heat." So the first blank (energy's action) is "released".
2. The form of energy released is "heat" (from "releases energy as heat").
3. For carbon: "produce carbon dioxide" shows carbon is "converted" (since it reacts to form a new compound).
4. The form of carbon after reaction is "carbon dioxide" (from the reaction product).

Answer:

When fossil fuels burn, much of the energy is \boxed{released} in the form of \boxed{heat}, and carbon is \boxed{converted} in the form of \boxed{carbon dioxide}.