The correct answer is: a) Coal
Coal is a fossil fuel formed by the remains of ancient plants that have been buried and subjected to intense heat and pressure over millions of years. It is a major source of energy for power generation, as well as for steel production and other industrial uses.
Tamil Nadu is one of the leading producers of coal in India. The state has several coal mines, including the Neyveli Lignite Corporation (NLC) mine, which is the largest lignite mine in India. Lignite is a type of coal that is lower in quality than other types of coal, but it is still a valuable energy resource.
Coal is a non-renewable resource, and its use contributes to climate change. However, it is still a major source of energy in many parts of the world, including India.
The other options are incorrect because:
- Lignite is a type of coal, not a mineral.
- Uranium is a radioactive mineral that is used in nuclear power generation.
- Natural gas is a fossil fuel that is used in power generation, but it is not a mineral.