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Why does oxygen occur naturally?
It is a byproduct of the life processes on Earth. Earth's early atmosphere contained no Oxygen, but Earth was slowly Terra-formed by life and obtained an Oxygen rich atmosphere.
What percentage of the air around us is oxygen?
The percentage of oxygen in the atmosphere is 20.75%. The atmosphere has many other elements that we breathe in besides oxygen. Oxygen needs to be present for life on earth.
Which gas in earth's atmosphere tells us that there is life on earth?
Oxygen, Nitrogen and Carbon dioxide, in that order. The most important element to sustaining life is Oxygen.
Where is the oxygen element found in real life?
It is found as Oxygen Gas (O2). This is about 1/4 of the earth's atmosphere (air).
Was the atmosphere of the earth always mostly nitrogen and oxygen?
No, the Nitrogen in the air has probably always been there (because nitrogen is rather inert), but originally Earths atmosphere was reducing (it had no free Oxygen) and probably contained large amounts of CO2 and hydrocarbons. The present atmosphere on Earth is the product of biological processes which have slowly introduced free Oxygen into the Oceans and then the atmosphere - life made Earth habitable for life!
What is main cause of earths atmosphere changing over time to support life?
Green plants evolved adding oxygen to the atmosphere.
As life began to populate earths surface what change was seen in the atmosphere?
more oxygen was consumed
How did earths atsmophere change during the precambrian time?
It changed from a reducing atmosphere containing no free oxygen to an atmosphere containing oxygen. The evolution of life on Earth "terraformed" the planet.
Why did the earth's atmosphere change after it was first formed?
The earths atmosphere has significantly altered over the years. The process of the earth's atmosphere was recognized and evolved 2.7 billion years ago, forming the nitrogen-oxygen atmosphere that exists today. This change enabled the formation and beginning of the ozone layer (which along with magnetic fields) block solar radiation.
How did the oxygen in the atmosphere get there?
The oxygen in Earth's atmosphere has been generated, over geological time, by the plant life on Earth.
Why does oxygen occur naturally?
It is a byproduct of the life processes on Earth. Earth's early atmosphere contained no Oxygen, but Earth was slowly Terra-formed by life and obtained an Oxygen rich atmosphere.
How does the atmosphere preserve life on Earth?
There is oxygen in the atmosphere. This lets us breathe.
How did the evolution of photosynthetic prokaryotes affect the level of oxygen in the atmosphere?
Photosynthesizing prokaryotes affected the ancient atmosphere by adding oxygen. In ancient times the oxygen level was .42%, compared to the 21% oxygen level now. Photosynthesizing prokaryotes have made the world livable today.
Which gas in Earth's atmosphere suggests that there is life on Earth?
The gas in earths atmosphere that suggests that there is life on Earth is oxygen. However carbon dioxide also shows that there is life on Earth.
What do you need in atmosphere to sustain life?
oxygen and sunlight
What gas in your atmosphere makes life possible?
oxygen
What percentage of the air around us is oxygen?
The percentage of oxygen in the atmosphere is 20.75%. The atmosphere has many other elements that we breathe in besides oxygen. Oxygen needs to be present for life on earth.
