sunlight aluminum natural gas ocean waves
I gave my students this multiple choice question: Students are learning about the natural resources in Maryland. One group of students researches information about renewable natural resources in the state. The other group researches information about nonrenewable natural resources in the state. The resources the students investigate include plants, animals, soil, minerals, water, coal, and oil. Which nonrenewable natural resource heats homes?

Only one answer is correct among these 4 choices:
- sunlight
- aluminum
- natural gas
- ocean waves

Could you tell me which one is correct?

natural gas