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: The '''Earth's Atmosphere''' formed 3.9 [[billion]] [[year]]s ago.
: [[Scientist]]s believe the '''Earth's Atmosphere''' was formed from [[gas]]es released from [[Volcano]]es on the early [[Earth]].
: [[Gas]] from the early [[Earth]] has been trapped in small bubbles in [[Volcanic]] volcanic [[rock]] showing it be mostly [[Carbon Dioxide]], [[Methane]] and [[Nitrogen]].
===Evolution of the Earth's Atmosphere===