Question

why are coal and petroleum considered to be non renewable source of energy​

Answer 1

Coal and petroleum are called non renewable resources because they cannot be formed quickly.They take a lot of time to form.They take even millions and billions of year to be formed.So coal cannot be replenished within a given time.Therefore it is considered to be non renewable resources.

Answer 2

Because coal and petroleum are present in less amount and they get depleated as we go on using them so they are called non renewable source of energy.