Why are fossil fuels like coal and petroleum classified as non-renewable or exhaustible energy sources?

Why are fossil fuels like coal and petroleum classified as non-renewable or exhaustible energy sources?
  1. They can never burn completely when ignited
  2. They take millions of years to form beneath Earth's crust and their reserves are limited
  3. They release kinetic energy instead of chemical energy
  4. They are naturally created faster than humans can use them

Solution

Fossil fuels are formed from ancient organic remains over geological timescales; once consumed, they cannot be replenished in a human timeframe.

Asked in: Homi Bhabha Practice

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