Primitive atmosphere vs current atmosphere on earth
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earlier atmosphere used to be clean and pollution free but now our atmosphere is polluted and dirty.
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Earth is believed to have formed from gas and dust orbiting the sun. ... The early Earth had a large amount of hydrogen and helium in the atmosphere and this would have slowly escaped into space due to the low mass of these gases. Today, hydrogen and helium make up less than 1 percent of the Earth's atmosphere.
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