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question_answer1) What surrounds the earth?
question_answer2) From where do the ultraviolet rays come?
question_answer3) What holds the atmosphere in place near the earth?s surface?
question_answer4) Which gas is used by the plants during photosynthesis?
question_answer5) How many layers are there in the atmosphere?
question_answer6) Which gas is dissolved in soft drinks like Coke and Pepsi?
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