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It doesn't; Earth has many other gasses. Our atmosphere is mostly nitrogen; only about 21% is oxygen.
It may be that you intended to ask, why does only Earth have free oxygen in its atmosphere, while other planets in the solar system don't. Free oxygen is produced by green plants (by a process called photosynthesis) and green plants grow only on Earth.
What else can I help you with?
What planet only has oxygen?
only earth idiot
Which of the eight planets has the highest percentage of oxygen?
Earth is only one planet where gaseous oxygen is found. The Earth's atmosphere is about 21% Oxygen.
What planet is the only with drinkable water?
Our planet, the Earth is the only planet with drinkable water. It is the only planet in our Solar System with life and oxygen. Without the oxygen, there will be no life and water on Earth.
Why can you only live on earth?
At earth,we can live because there is oxygen and more gravity
Why earth is the only planet where life exist?
beause earth is the only planet which has oxygen and other needed sudstances .
What are gases surrounding the earth?
Hydrogen and oxygen are only a few.
What are the orders from greatest to least of the oxygen on earth?
Since there is only one element to be ordered, the greatest is oxygen and the least is oxygen!
How is Neptune different form earth?
first the earth is way closer to the sun plus earth only has oxygen
Why is earth the only planet for man?
Because it is the only planet that have oxygen and have water and food on it.
Are CO2 and Oxygen the only gasses on earth?
No, they're not. In fact, about 78% of the Earth's atmosphere is nitrogen.
Why earth is called an unique planet?
earth is supposedly the only planet that can sustain life and has oxygen
What is the percentage of Oxygen on earth?
Earth contains 21 percent of oxygen in the atmosphere!coz earth contains only hot gases and oxygen is not a hot gas!:D
