Which of the following is a renewable natural resource?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Timber
A renewable resource is one that nature replaces within a human lifetime. Timber comes from trees, and forests can be regrown by planting, so it is renewable as long as it is not cut faster than it grows.
Why the other options are incorrect
Option (2) Thorium — Incorrect. Thorium is a radioactive mineral used as nuclear fuel; its stock in the earth is fixed.
Option (3) Natural Gas — Incorrect. Natural gas is a fossil fuel formed over millions of years, so it cannot be replaced once used.
Option (4) Coal — Incorrect. Coal is also a fossil fuel, formed from plants buried millions of years ago.