What Are Clouds Made Of?
8. Fog
Fog is caused when ice crystals form in the air at ground level. This basically makes it a type of very low-flying cloud. It is fairly common in some parts of Europe in particular and has the ability to significantly reduce visibility. When there is a heavy fog, driving and flying can become considerably more dangerous than otherwise. In some parts of the world, fog is also an important part of the water cycle.
In California, for example, California Redwoods get around 30-40% of their water from fog. There are different types of fog that form according to the conditions at the time.
