Gap Fill - Clean Air - Level 6

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   atmospheric      far      free      microbes      places      rather      scientists      source      they      wind  

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The analysed the structure of airborne in the lower clouds over the Southern Ocean. They looked at the DNA of the microbes and tracked where came from. Their analysis included monitoring trajectories to detect how the microbes may have travelled. They found that the eco-system was very much "isolated," self-contained, and from contaminants from elsewhere in the world. The of the microbes was the Southern Ocean, than airborne pollutants from other continents. The researchers concluded that the Southern Ocean is one of very few on Earth that has been "minimally affected by anthropogenic activities."

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