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In this time period there was no atmosphere it was just gas and solids

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Cyanobacteria which is blueish green microscopic organisms created more oxygen in the atmosphere

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Over time methane and oxygen reacted for the atmosphere. After the methane cleared the sky was blue

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Oxygen made up the atmosphere and rose up to 35 percent over the next 50 mil years

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Now its way warmer than it used to be causing ice to melt because of the atmosphere now.