Please choose the correct answer to the 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?

Answer1: sunlight Answer2: aluminum Answer3: natural gas Answer4: ocean waves

Answer format: answer1/answer2/answer3/answer4
Answer: answer3