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    Question

    Which of the following is a nonrenewable source of

    energy?  
    A Solar energy Correct Answer Incorrect Answer
    B Wind energy Correct Answer Incorrect Answer
    C Natural gas Correct Answer Incorrect Answer
    D Hydroelectric energy Correct Answer Incorrect Answer

    Solution

    Natural gas is a fossil fuel, which takes millions of years to form.   Once used, it cannot be replenished easily.   In contrast, solar and wind are renewable and sustainable.   Non-renewable cause pollution and are limited.

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