The Brainliest Answer!
The fossil fuels in the earth took many millions of years to form. Right now, we are using fossil fuels very rapidly, way faster than they can be naturally replenished; thus making them exhaustible.

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Fossil fuels take a million years to form and now we people are using it without thinking of it . so it should not be wasted and our next generation can also see them. to save and prevent the wastage