Earth early Atmosphere

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Chemical formula for methane is CH4
Element is one type of atom
molecule is one or 2 elements not chemically bonded
200million years ago the atmosphere has remained relatively constant
Now the atmosphere is NITROGEN 78% and OXYGEN 20% other 1% this could be CARBON DIOXIDE AND NOBLE GASES And water vapor
Earth was formed 4 .5 billion years ago
volcanic eruptions release carbon dioxide water vapour and ammonia
As earth called water vapour condensed to form ocean because condensation is when you go from a gas to a liquid
When the oceans formed carbon dioxide dissolved in water which reduced carbon dioxide in the atmosphere
During this time, evidence was
Limited so scientist got the evidence from data of volcanic eruptions release large carbon dioxide and scientist identified the concentration of oxygen in each and os
When the Earth was formed, it was inhabitable because there was large proportions of carbon dioxide and there was no oxygen as humans. We need oxygen because we need respiration.