Answer: Flyash
Explanation:
Flyash is a waste produced after the combustion of the coal in a power plant. The ash is in the form of small dark flakes.
The natural gas is a fuel which is produced by the degradation and decomposition of the organic matter generated from plant and animal matter. The following are the sources of the natural gas: oils, wells, biomass and landfill as they are sources of deposited organic matter. But flyash contains very less organic content.
