The correct option is Iron ore.
Explanation
Natural resources are classified into renewable and non-renewable categories based on their exhaustibility and the time required for their regeneration. Non-renewable resources have limited stocks and require geological time scales (millions of years) to form, making them exhaustible within a human lifespan.Option Analysis
- Iron ore is Correct: Iron ore is a mineral resource. Minerals are formed through geological processes over millions of years. Since the rate of consumption by humans far exceeds the rate of natural formation, they are considered finite and non-renewable.
- Solar radiation is Incorrect: Solar radiation is a continuous flow of energy from the sun. It is inexhaustible and naturally replenished, making it a renewable resource.
- Tidal energy is Incorrect: Tidal energy is generated by the gravitational forces of the moon and the sun acting on ocean waters. This is a repetitive and predictable natural phenomenon, classified as a renewable resource.
- Geothermal energy is Incorrect: Geothermal energy is derived from the internal heat of the Earth. While local wells can cool down, the Earth's internal heat is vast and continuously produced by radioactive decay, classifying it as a renewable resource for practical purposes.
Key Takeaway
Minerals (metallic and non-metallic) and fossil fuels are non-renewable resources due to their finite stocks and long formation periods, whereas sources like solar, wind, tidal, and geothermal energy are renewable.