1. what are fuels?
2. what is coal ?

Dear Student,

Please find below the solution to the asked query:

https://www.meritnation.com/ask-answer/question/what-are-fuels-r-n-rn/combustion-and-flame/2895725

https://www.meritnation.com/ask-answer/question/what-is-coal/coal-and-petroleum/9526859

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