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Origin and Evolution of the Earth's Atmosphere

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Origin and Evolution of the Earth’s Atmosphere
Our present day oxygen is originated from H2O molecules and CO2 molecules. The high UV light divides the bonds between the molecules, leaving us with O and OH, which react to form O2 (molecular oxygen) and H. After the O2 begins to gather in the air, the ultraviolet light uses it ability to split matter, it then splits the O2 and produces O (atomic oxygen). Ozone is soon formed after the oxygen atoms react with the O2 to form ozone (O3). The ozone then proceeds to absorb dangerous forms of UV in order for life forms to live on the ground. The 2nd and more important source of atmospheric oxygen is plant life. Plants use photosynthesis to produce oxygen. They need water, carbon dioxide, and sunlight to grow, they then turn the H2O and CO2 into plant material, the product is O2.
Our present day atmosphere is composed of 5 main components: N2, O2, H2O, Ar, and CO2. N2 (nitrogen), is a clear cold liquid. It is also the most abundant gas in our present day air (77%). O2 (oxygen), is a pale blue liquid, and is also is 20% of the air we breathe. H2O (water vapor), makes up 20% of our present day air and is also a greenhouse gas and it’s concentration ranges from 0-4%. It also occurs naturally in gas, liquid, and solid phases. Ar (argon), is one of the several noble gases. It comes from radioactive decay of potassium in the ground. CO2 (carbon dioxide), is a greenhouse gas.
The Earth’s original atmosphere was composed of H, He, CH4, and NH3. H (hydrogen) and He (helium) made up most of the original atmosphere. While CH4 (ammonia) and NH3 (methane) made up smaller amounts of the atmosphere. These original atmospheric gases were believed to have escaped into space, or blown away by the solar…...

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