Because the (solid part of the) planet rotates, and because the Sun warms up different areas as they are exposed to sunlight, you end up with a lot of wind moving the atmosphere around. [Prevailing Winds](https://en.wikipedia.org/wiki/Prevailing_winds) is what they’re called, and as you can see the air is “thoroughly circulated” pretty much everywhere.
Because there is a lot of air in the atmosphere, and some 21% of it is oxygen.
That oxygen its cycled around the world by the complex air currents that make up the weather. So in a desert, you are breathing oxygen that is carried over there by winds from hundreds of miles away.
A majority of oxygen in the atmosphere is made by plankton in the ocean. But if you were to remove all plants and plankton from the earth, we would have enough oxygen to supply 7.5 billion people and the remaining animals for about 370 years. It would be centuries before people would start suffocating and dropping dead just walking around. But nothing would be left alive in the first place by that point because of food chain collapse.
If I take a glass of water and drop some red food colouring in it, it mixes around a bit on its own. Over time, the liquids will mix together on their own a bit. Even more if I stir it a single time with a spoon.
Gasses are the same way. As other posters have said, there’s actually so much oxygen elsewhere that over time, it and other gasses will mix together. Add the wind into the equation, and it mixes that much faster, even over vast distances.
Because the (solid part of the) planet rotates, and because the Sun warms up different areas as they are exposed to sunlight, you end up with a lot of wind moving the atmosphere around. [Prevailing Winds](https://en.wikipedia.org/wiki/Prevailing_winds) is what they’re called, and as you can see the air is “thoroughly circulated” pretty much everywhere.
Because there is a lot of air in the atmosphere, and some 21% of it is oxygen.
That oxygen its cycled around the world by the complex air currents that make up the weather. So in a desert, you are breathing oxygen that is carried over there by winds from hundreds of miles away.
A majority of oxygen in the atmosphere is made by plankton in the ocean. But if you were to remove all plants and plankton from the earth, we would have enough oxygen to supply 7.5 billion people and the remaining animals for about 370 years. It would be centuries before people would start suffocating and dropping dead just walking around. But nothing would be left alive in the first place by that point because of food chain collapse.
If I take a glass of water and drop some red food colouring in it, it mixes around a bit on its own. Over time, the liquids will mix together on their own a bit. Even more if I stir it a single time with a spoon.
Gasses are the same way. As other posters have said, there’s actually so much oxygen elsewhere that over time, it and other gasses will mix together. Add the wind into the equation, and it mixes that much faster, even over vast distances.
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