Fog in the Valley, Cloud on the Mountain

A cloud is covering the valley and obscuring Great North Mountain. Or is that fog?

I went to Wikipedia to see what the difference is. "While fog is a type of stratus cloud, the term 'fog' is typically distinguished from the more generic term 'cloud' in that fog is low-lying, and the moisture in the fog is often generated locally (such as from a nearby body of water, like a lake or the ocean, or from nearby moist ground or marshes.)" A footnote points out that "An observer on the mountain may say that he or she is in a fog, however, to outside observers a cloud is covering the mountain."

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