Which of the following is NOT a renewable resource?

Coal is a fossil fuel formed from the remains of ancient plants that have undergone geological processes over millions of years. This process involves the decomposition of organic matter under layers of soil and rock, transforming it into coal. Once mined and used, coal is not replenished on a human timescale, making it a non-renewable resource.

In contrast, solar energy, wind energy, and hydropower are all forms of renewable resources. Solar energy harnesses the power of the sun, which is continuously emitted and inexhaustible on a human timescale. Wind energy captures the kinetic energy produced by moving air, and as long as there is sunlight and atmospheric movement, wind will continue to be available. Hydropower uses the flow of water, which is part of the natural water cycle and can be consistently replenished through precipitation and evaporation.

Thus, coal stands out as a non-renewable resource, while the others are renewable and can be used sustainably over time.