How does Fog form?

The scene can be eye-catching as fog floats above the river or seems to hang throughout a quiet park as if set up on a stage for a musical.

What is this mysterious happening though?

Fog is defined as, “Water droplets suspended in the atmosphere in the vicinity the earth’s surface that affect visibility”, according to the Glossary of Meteorology from the American Meteorological Society.

How does this happen exactly!?

Fog forms when cool air passes over a warm body of water or moist land. The temperature difference is the key! When the air is cooler than the earth/water below and the humidity is high enough –  water vapor in the air forms the fog!

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