eraths atmosphere and eveloution Flashcards
1
Q
What % of the atmosphere is made up nitrogen
A
80%
2
Q
What is the % of oxygen in the atmosphere
A
20%
3
Q
What are the 5 gasses in the earths atmosphere
A
water vapour, nitrogen,oxygen nitrogen and carbon dioxide
4
Q
what was beloved to be realised from volcanoes 4.6 million years ago
A
Carbon dioxide
5
Q
How was the level of CO2 reduced
A
By photosynthesis
and by the rocks in the seas ( sedimentary rocks) absorbing the carbon dioxide
6
Q
What happened to the water vapour in the early atmosphere
A
Precipitated
7
Q
A
