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Related Questions
What was the earths atmosphere before photosynthesis?
Without life because when plants do photosynthesis, they produce oxygen.
How much of the earths atmosphere is made up of nitrogen and oxygen?
The earths atmosphere is made up of 78% nitrogen and 21% oxygen
What percent of earths atmosphere is oxygen?
97%
Is most of the earths atmosphere covered with oxygen?
no
The primative earths atmosphere did not contain?
Free oxygen
The primitave earths atmosphere did not contain?
Oxygen gas
What is the major source of oxygen for the earths atmosphere is?
Plants
What gas was not part of early earths atmosphere?
oxygen
What planet has a nitrogen- oxygen atmosphere?
Earths atmosphere is rich in Oxygen, some 21% of the air is Oxygen. There is oxygen on other planets, but the percentage comes nowhere close to this. The percentage of Oxygen in earths atmosphere is thought to have been much higher in the past, before animals were about, but after the arrival of plants.
What are the primary gases found in earths atmosphere?
Nitrogen and oxygen,
Was the earths early atmosphere made up of mostly oxygen?
no
What describes the earths atmosphere?
mostly nitrogen with 21% oxygen
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