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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 [[rock]] showing it be mostly [[Carbon Dioxide]], [[Methane]] and [[Nitrogen]]. Some evidence also suggests there may have been high quantities of [[ammonia]].: If there had been any [[Oxygen]] in the early '''atmosphere''' it would have reacted with the [[Methane]] to produce [[Carbon Dioxide]] and [[Water]] or any [[Reactivity Series|reactive]] [[metal]]s to produce [[Metal Oxide|metal oxides]].
===Evolution of the Earth's Atmosphere===