The correct option is **C. Natural gas**. ### Detailed Explanation 1. **Understanding Renewable vs. Non-Renewable Energy Resources**: - **Renewable energy resources** are those that can be replenished naturally in a short period of time. They are sustainable and have a lower environmental impact. Common examples include solar energy, wind energy, and hydropower. - **Non-renewable energy resources**, on the other hand, are those that do not replenish at a sustainable rate. They are finite and can take millions of years to form. Natural gas, coal, and oil fall into this category. 2. **Analysis of Each Option**: - **A. Solar energy**: This is derived from the sun's radiation. It is abundant and can be harnessed using solar panels. As long as the sun exists, solar energy is renewable. - **B. Wind energy**: This is generated by converting the kinetic energy of wind into electricity using wind turbines. Wind is a natural phenomenon that is continuously replenished, making it a renewable resource. - **C. Natural gas**: This is a fossil fuel formed from the remains of ancient marine organisms over millions of years. It is extracted from the earth and, once used, cannot be replaced on a human timescale. Therefore, it is classified as a non-renewable energy resource. - **D. Hydropower**: This energy is produced by harnessing the energy of flowing water, typically from rivers or dams. As long as the water cycle continues, hydropower is renewable. 3. **Why Other Options Are Incorrect**: - **A. Solar energy**: Correctly classified as renewable because it is abundant and sustainable. - **B. Wind energy**: Also correctly classified as renewable due to its continuous availability and minimal environmental impact. - **D. Hydropower**: Correctly classified as renewable since it relies on the natural water cycle, which is perpetually replenished. ### Common Pitfalls - **Confusing renewable and non-renewable resources**: Students often mix up these terms. Remember that renewable resources can be replenished naturally and quickly, while non-renewable resources take millions of years to form and are finite. - **Overlooking the environmental impact**: While some non-renewable resources like natural gas are cleaner than coal or oil, they are still not renewable. It’s important to focus on the sustainability aspect. ### Summary - Renewable energy resources can be replenished naturally and quickly (e.g., solar, wind, hydropower). - Non-renewable energy resources are finite and take millions of years to form (e.g., natural gas). - Natural gas is classified as a non-renewable resource, making option C the correct answer. - Understanding the definitions and characteristics of energy resources is crucial for distinguishing between renewable and non-renewable sources.