Which of the following gases is NOT a major contributor to air pollution?
AOxygen
BCarbon dioxide
CSulfur dioxide
DNitrogen oxide
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How much of the Earth's surface is covered with water?
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ദക്ഷിണാർധ ഗോളത്തിൽ ഏറ്റവും ദൈർഘ്യമേറിയ രാത്രി അനുഭവപ്പെടുന്ന ദിവസം ?
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