Gap Fill - Clean Air - Level 4


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   activity      aerosols      air      clouds      continents      pristine      purity      research      south      they  

Paragraph 1

Scientists found what think is the cleanest on Earth. Researchers conducted on the of the air above Antarctica. An area between the of Australia and Antarctica was "unaffected" by human . The analysis of the air in the showed it was free from "anthropogenic ". These are pollutants from human activity, or dust from other . The scientists called this pollution-free area, "truly ".

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