Fill in the Blanks Fill in the Blanks: Understanding Combustion and FlameOnline version Test your knowledge on combustion processes and flames in this engaging fill-in-the-blanks game! by Demetrius Sam Daniel 1 oxygen itself fire air Combustion is a chemical reaction in which a substance reacts with to produce heat and light . 2 fire burning combustio arson The process of burning paper , wood , or ethanol is also known as 3 Paper Candle Ethanol Coal is an example of a clean - burning fuel because it produces very little smoke . 4 lightning heat ethanol fuel patience fire The three components necessary for combustion are , oxygen , and .