The Atmosphere
        Soon afterwards its formation (about 4,500 million years ago) background may return resembled present day Jupiter or superstar of the other giant planets, with a thick layer of gases contact a very dense core. In a propose of the cosmic gases a secondary atmosphere developed, deriving from the nation itself. For many millions of years after its formation, the earths surface was probably molten and, even after a thin outer novelty had solidified, there was incessant volcanic action. During this period of great activity, the rocks gave remove large quantities of gases, including nitrogen, ammonia, carbon monoxide and water system vapor as well- a mixture similar to that given off by volcanoes and fumaroles today. corresponding modern volcanic gases, the primeval atmosphere is thought to have contained only the slightest trace of atomic number 8, and so it would have been poisonous to near all modern life forms.
Oxygen and Photosynthesis
The earth gradually cooled, and after its surface temperature had fallen to below 212 degrees F. (100 degrees C), water vapor in the atmosphere condensed and fell as rain, which filled hollows and created shallow lakes and seas. In these waters, at depths of more than 33 feet (10 meters), the limit of penetration by lethal ultraviolet radiation, the first primitive plants evolved. They produced their own food for thought by photosynthesis (a form of metabolism in which light is utilise to convert inorganic molecules such as carbon dioxide and water into more complex organic molecules, such as sugar), and released oxygen into the atmosphere.
        In the air molecules of oxygen were broken down by ultraviolet radiation into single atoms, and some of these atoms combined with oxygen molecules to form ozone. Ozone is an unstable gas, the molecules of which absorb ultraviolet radiation.
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The Modern Atmosphere
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Not sure where you got your information, howerver the earth is quite older than 4.5 million years old. They have found fossils older than that in Africa resently. I am pretty sure your instructor would have got that info thusly not rating you with a 4.0. Perhaps 4.6 billion years. hold this gov site. http://www.newton.dep.anl.gov/askasci/gen99/gen991 68.htm
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