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    Question

    Hot air balloon rises up

    because 
    A hot air lighter than cold air Correct Answer Incorrect Answer
    B hot air has higher energy Correct Answer Incorrect Answer
    C hot air has a higher pressure Correct Answer Incorrect Answer
    D hot air has a lower pressure Correct Answer Incorrect Answer

    Solution

    Hot air rises up because it is lighter than cold air. As the air inside the balloon is hotter than the air surrounding the balloon it rises up.

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