EVOLUTION OF EARTH'S ATMOSPHERE
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Last updated 6:27 PM on 2/13/23
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4 Terms
1
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Describe the proportion of gases in the modern atmosphere
**80%** N2
**20%** O2
**small proportions:** CO2, H2O, nobles gases
**20%** O2
**small proportions:** CO2, H2O, nobles gases
2
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How was the Earth’s early atmosphere formed
Earth = **hot** when formed
significant **volcanic activity**
**gases** released from volcanoes:
**Nitrogen, Carbon Dioxide, Ammonia, Methane, Water Vapour**
significant **volcanic activity**
**gases** released from volcanoes:
**Nitrogen, Carbon Dioxide, Ammonia, Methane, Water Vapour**
3
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How did the amount of **oxygen** increase in the atmosphere
Algae and Plants formed
Oxygen was produced by photosynthesis
As oxygen levels increased there were more plants.
Oxygen was produced by photosynthesis
As oxygen levels increased there were more plants.
4
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How did the amount of **carbon dioxide** decrease in the atmosphere
Algae and Plants absorbed carbon dioxide for photosynthesis
Formation of sedimentary rocks + fossil fuels **(containing carbon)**
Formation of sedimentary rocks + fossil fuels **(containing carbon)**