C13 The earths atmosphere Flashcards
1
Q
what’s gas is most abundant in our atmosphere today
A
nitrogen
2
Q
how was the early atmosphere formed
A
by volcanic activity
3
Q
what was (likely) in the early atmosphere
A
mainly carbon dioxide
nitrogen
water vapour
traces of methane and ammonia
4
Q
what increased oxygen levels on earth
A
plants
5
Q
what removed carbon dioxide from the early atmosphere
A
plants photosynthesising
formation of sedimentary rocks
formation of fossil fuels
