The difference between fog and a cloud is:
A)they form via a different process.
B)fog never forms in mountains.
C)clouds can have ice crystals in them but fog can't.
D)nothing. Clouds and fog are a matter of observational perspective.

Question

Quizplus · Accepted Answer

Fog is essentially a cloud that is in contact with the ground. The primary difference between fog and clouds is not their composition or formation process, but rather their location relative to the Earth's surface. Both can consist of water droplets or ice crystals, and both can form under various conditions. Therefore, the distinction is largely one of observational perspective, with fog being observed at ground level and clouds being observed in the sky.

The Difference Between Fog and a Cloud Is