What does an engine require burning?
Time and energy energy wind water carbon dioxide layers of fat fossil fuels sunlight
A B C D E F G H
Fossil fuels include coal, oil, natural gas, and gasoline.
using a fossil fuel engine requires burning fossil fuels
What does an engine require burning? (A) Time and energy (B) energy (C) wind (D) water (E) carbon dioxide (F) layers of fat (G) fossil fuels (H) sunlight