5. What are the two most abundant gases in today\'s atmosphere? Give a percentag

Question

5. What are the two most abundant gases in today's atmosphere? Give a percentage of the atmosphere for each.
6. How does this compare to the gases coming out of volcanoes?
7. If volcanoes were the main source of the gases found in our atmosphere today, and if Proterozoic volcanoes released similar gases (and we think they did), then what happened to the vast amounts of carbon dioxide gas? Explain using two steps.
8. Why is the process of oxidation important for understanding how our atmosphere evolved? What minerals were NOT oxidized and what does that tell us, and what mineral WAS oxidized and when and how did this happen?
9. What would Earth be like today if the excess carbon dioxide had not been removed from the atmosphere in Precambrian time?

Explanation / Answer

5.

The two most abundant gases in today's atmosphere are Nitrogen and Oxygen with the concentration of 78% and 21% approximately.

6.

The amount of Nitrogen and Oxygen released from the volcanoes is incomparable with concentration of Nitrogen and Oxygen present in the atmosphere as the mass of atmosphere is 5.1 x 1018 kg and 78% and 21% of 5.1 x 1018 kg is a very high quantity.

7.

Proterozoic is the time from precambrian era and after this era we have the paleozoic era in which we have carboniferous period before that period we have a burst of land plants which took up the carbon dioxide gas emitted from the Proterozoic volcanoes and hence we have huge amount of Oxygen produced by the process of photosynthesis (the process by which the greeen plants prepare their food in the preseence of sunlight to give oxygen as a by product) and this is why we don't have that much amount of carbon dioxide gas in our atmosphere.

8.

If we'll see the sedimentary stratas then we'll be seeing red and brown colour soil which is because of the oxidastion of iron (the process known as rusting) this is seen only in the rocks after cambrian period because of the oxygen present after that period only and hence it tells us about the presence of oxgen and the amount of oxygen present in the atmosphere (more the oxygen more is the oxidised product).

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