Geology DQ

Geology DQ - 1. Earths atmosphere formation began 4.57 Ga...

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1. Earth’s atmosphere formation began 4.57 Ga ago, when the solar wind stripped off the Hydrogen and Helium. Volcanic gases (water, carbon dioxide, sulfur dioxide, nitrogen, ammonia) accumulated in 3.9 Ga, causing a secondary atmosphere to form. As the planet began to cool, condensed rain formed what is now ocean water, overall level of carbon dioxide decreased, and stable N2 level increased. Photosynthetic cyanobacteria also decreased levels of CO2, and thus added O2 to the atmosphere, yielding to the formation of many other life forms over a span of time. 2. Ozone comes from a two step reaction, with normal oxygen O2 reacting with the sun, which separates the two into individual atoms. Then the individual 0 atoms react with another oxygen atom, 02, to form ozone, 03. Ozone is important because it absorbs radiation from solar radiation. 3. The air is made of 78% Nitrogren, 21% Oxygen, and 1% of the following: argon, carbon dioxide, methane, sulfur dioxide, ozone, and radon. 4.
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This document was uploaded on 10/28/2011 for the course GEOL 101 at UNC.

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Geology DQ - 1. Earths atmosphere formation began 4.57 Ga...

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