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.
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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