Essay on The Current Earth 's Atmosphere

1069 Words Jan 29th, 2015 5 Pages
The current earth’s atmosphere is made up of Nitrogen (N2), Oxygen (O2) and a small amount of other gases. However the early earth which was formed 4.5 billion years ago was made up of Ammonia (NH4) and Carbon Dioxide (Co2). 4 billion years ago the world was covered with volcanos. The volcanoes released Carbon Dioxide (CO2) methane (CH4) and water vapour. The oxygen levels were 0.000%, also meaning no oxygen. 3.2 billion Years ago life of bacteria was forming and increasing. This made food by breaking down available nutrients. This produced more oxygen and made the oxygen level increase slightly to 0.001%. 600 million years ago oceans were formed from water vapour and made the oxygen levels increase even more to 0.21%. As soon as vegetation grew the oxygen levels rose dramatically to 2.1%. The earth in the present day, oxygen is now at. Roughly 21%, nitrogen at 78% and 1% of other gases. Carbon dioxide levels though have gone up recently. The proportion of Oxygen went up due to the amount of photosynthesis by plants. The proportion for Carbon Dioxide went down because it was locked up in fossil fuels and sedimentary rock such as limestone. It also was absorbed by plants for photosynthesis. Now we are burning those plants and fuels which is releasing the carbon dioxide into the atmosphere.

Global warming is where the suns radiation is getting trapped because of the Carbon Dioxide from factories, cars and power stations. This is making the temperature increase and the…

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