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How old is the earth?
4.6 billion years old
4600 million years old for w
For how long has the earths compositions being roughly the same
200 million yearswhatb
What gases are present in our atmosphere today
Nitrogen
Oxygen
Argon
Carbon Dioxide
Water Vapour
Percentage of nitrogen
78%
Percentage of oxygen
21%
Percentage of other gases (carbon dioxide, argon and water)
1%
What gases were present in the earths atmosphere originally
Mainly carbon dioxide
Methane
Ammonia
What did the early earths atmosphere resemble?
Venus and Mars atmosphere now
Theory about Earth
Intense volcanic activity and it was very hot when formed
Volcanoes released : carbon dioxide, methane, ammonia and water vapour
Where did oxygen come from?
PlAnts evolves and used carbon dioxide for photosynthesis when reacting with water which produced oxygen
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