why is oxygen important to earth atmosphere
Oxygen in the atmosphere is important for life for two main reasons. First, oxygen makes up the ozone layer. The ozone layer is in the upper part of the atmosphere, and is mad â¦ e of O3 molecules-a particular type of oxygen molecule.It blocks harmful radiation from the sun and keeps it from reaching Earth's surface.he way the oxygen got into our atmosphere is when the green plants do photosynthesis. Green plants take in carbon dioxide, sunlight, and water to make glucose and of course o â¦ xygen. After a while, the plants did enough photosynthesis that the earth got an atmosphere.