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: The '''Earth's Atmosphere''' is essential to the survival of many [[Alive|living]] [[creature]]s on the [[planet]].
: The '''Earth's Atmosphere''' has not always had the same proportions of [[gas]]es. 3.9 [[billion]] [[year]]s ago there was no [[Oxygen]] in the [[atmosphere]]. In the last 200 years humans have caused the [[Carbon Dioxide]] in the '''Earth's Atmosphere''' to double.
==Key Stage 4==
===Formation of the Earth's Atmosphere===
: 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]].