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Level 1

The Evolution of the atmosphere


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Molten
the substance the Earth was originally made of for millions of years
Volcanic eruptions
gave out gases including carbon dioxide and water
The early atmosphere
mostly contained carbon dioxide and virtually no oxygen
Oceans
formed when water vapour condensed
Green plants
these evolved and produced oxygen in photosynthesis
Complex animals
due to the increase in oxygen these could start to evolve
Ozone layer
was created by the oxygen which blocked harmful rays from the sun and enabled even more complex organisms to evolve
Today's atmosphere
contains 78% nitrogen, 21% oxygen and small amounts of other gases
Fossil Fuels
when burnt release carbon dioxide
Deforestation
when trees are cut down there are less trees to take in carbon dioxide
Livestock farming
releases huge amounts of methane into the atmosphere