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Oxygen oasis in Antarctic lake reflects Earth in the distant past

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Lake Fryxell, Antarctica is permanently covered in ice, and the waters at the bottom are oxygen-free but still receive some sunlight. Scientists have discovered a thin layer of oxygen created by photosynthetic bacteria at the bottom of the lake. This could be a model for conditions on Earth 2.4 billion years ago, before oxygen became common in the atmosphere.

See for further details: http://www.astrobio.net/topic/solar-system/earth/biosphere/oxygen-oasis-in-antarctic-lake-reflects-earth-in-the-distant-past/

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