Saturday, August 13, 2011

What are the three steps that took place during the atmospheric evolution which contributed to the dramatic?

volcanic eruptions released large amounts of gases, such as water vapor, carbon dioxied, and ammonia. this proccess is known as outging. the gases released during the outging interacted with radiation from the sun. the solar radiation caused ammaonia and some water vapor in the atomsphere to break down. most of the hydrogen that was released during the break down escaped into space. some of the remaining oxygen formed ozone. the ozone collected in a high atospheric layer around theEarth and shielded Earths surface from the harmful ultraviolet radiation of the sun. organisms that could survive in Earths early atmosphere developed. some of these organisms, such as cyanobacteria and early green plants, used carbon dioxided during photosynthesis. oxygen, a byproduct of photosynthesis, was released. so, the ammount of oxygen in the atmosphere slowly increased.

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