Earths Atmosphere Development Flashcards
1
Q
What was the earth covered in in first billion years?
What gas was mostly in the atmosphere?
How were oceans formed?
A
Covered in volcanoes
Mostly carbon dioxide , little or no oxygen.
Volcanoes also released nitrogen, water vapour and small amounts of methane and ammonia.
Oceans formed when water vapour condensed,
2
Q
What changed as the early atmosphere evolved into modern?
Whag happened to CO2?
A
Co2 was removed from atmosphere
lots dissolved in oceans.
It he dissolved co2 formed carbonated that were sediments.
When green plants and algae evolved, they took in some co2 during photosynthesis.
3
Q
What created oxygen for the atmosphere today?
A
green plants and algae .
