This is an image of fog in a Martian canyon.
Click on image for full size
Image from: NASA
This picture shows fog on Mars. More fog has been seen in images returned by Mars Global Surveyor of the south polar region of Mars.
Martian fog may have a little bit of acid mixed in with the water drops. (Rain on Earth also contains a little bit of acid). Acid in the fog may contribute toward weathering of the Martian surface rocks.
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