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It burns faster (and hotter).
Nitrogen 78%, oxygen 21%
Anything that burns in the natural atmosphere, which is only about one fifth oxygen, would burn much faster in pure oxygen.
Pure gold is a noble metal and does not combine readily with anything. It is inert in an oxygen atmosphere and will not burn.
Oxygen, carbon dioxide (no air is perfectly pure oxygen),and trace gases. So the atmosphere is made up of many many gases
If the atmosphere had always been pure oxygen, life as we know it would never have developed. If the atmosphere suddenly became pure oxygen, wild fires would rage throughout the world, and most plants and animals would die in a short time.
Forest fires would be much worse than they are, but people would be able to climb Mount Everest without taking oxygen bottles.
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Because too much oxygen is harmful to the environment.
Without nitrogen in the atmosphere, we would be breathing in nearly pure oxygen, which would be fatal.
Because it's mostly made of pure oxygen.
If by Oxygen you mean pure Oxygen molecules, then no, only possible trace amounts. However, there is massive amounts of Carbon Dioxide (95% of Venus's atmosphere) which can be fairly easily be converted into oxygen.
It burns faster (and hotter).
Nitrogen 78%, oxygen 21%
Pure carbon combusts in an oxygen atmosphere to produce carbon dioxide and heat. C + O2 --> CO2
Anything that burns in the natural atmosphere, which is only about one fifth oxygen, would burn much faster in pure oxygen.
A glowing splint will burst into flame/smoke in pure oxygen (using a test tube).