Flashcards in Atmosphere Quizzes Deck (13):
What do scientists look to for how the early atmosphere was?
planets and moons that have no life
Antarctic ice cores (trapped gases)
What gases do volcanoes release?
Carbon dioxide, water vapour
Little Methane, nitrogen and ammonia
What was early atmosphere made up of?
Little to no Oxygen
Large amount of Carbon dioxide
Water vapour + small amounts of other gases
How were oceans formed
Water vapour released from volcanoes condensed
as earth cooled down
Why is it difficult to be certain about the early atmosphere?
There is only limited evidence
conflicting evidence like Titan=98% nitrogen and mars and venus mainly carbon dioxide
How was the early CO2 reduced
Dissolved into oceans
Got locked up in marine organisms, buried under layers of sediment, in carbonate rocks
Plants used it for photosynthesis
Current nitrogen percentage
Current oxygen percentage
Current argon percentage
Current carbon dioxide percentage
Name the current atmosphere's gases
How did oxygen affect the early atmosphere
Killed off unadapted, allowed others to survive
Formed ozone layer (O3), blocks harmful rays and allowed life to evolve
Reduced the carbon dioxide amount