1) It happens when there's no rain for a long time a) b) 2) It happens when there's too much rainfall a) b) 3) It happens because the Earth's atmosphere is polluted a) b) 4) It can happen because of men's activities and wars  a) b) 5) It's in our atmosphere to protect us from radiation a) b) 6) It's the reason of pollution a) b)

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