Earths atmospheric evolution
Storyboard Text
- scientists believed that the earths atmosphere contained little to no oxygen but was mainly carbon dioxide and some nitrogen.intense volcanic activity produced lots of carbon dioxide,water vapour and nitrogen
- As the water vapour condensed into liquid water it formed the oceans whihc allowed a lot of the carbon dioxide to dissolve into the water
- 2.7 billion years ago,algae began to appear and become more rapid as green plants began to evolve over the following billions of years due to photosynthesis,the plants took in oxygen and carbon dioxide from the atmosphere and produced oxygen,as oxygen built up more wildlife began to evolve
- Because lots of plants, algae and other organisms died an sunk to the bottom of the oceans, with large quantities of sedimentary rock and fossil fuels in the ground. Over millions of years this sediment became compressed to form a sedimentary rock
- Now, 78% of the Earth`s atmosphere is nitrogen, 21% is oxygen, 0.9% is argon, 0.04% is carbon dioxide, leaving the other 0.06% methane and water vapour.
- Human activities are leading to an increase amount of greenhouse gases in the atmosphere; such as carbon dioxide and methane. One reason why the amount of carbon dioxide is increasing, is that very large quantities of fossil fuels are being burned.
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