Book 4, Question 88
Why Does Fog Hug the Ground?
Fog is a cloud that formed at ground level! When cool air near the ground makes water vapor condense, you get tiny drops that you can walk through. Those drops hang right where the cooling happened, down low.
From the book
Page from A Million Whys Book 4
More fun facts
- Fog forms only near the ground, while clouds can form at many different heights.
- Walking through fog is a lot like walking through a cloud.
- Fog forms when the air near the ground cools enough to turn water vapor into tiny drops.
- Fog often forms on calm, damp nights when the ground cools off.
- Sometimes cool air near the ground is trapped under warmer air above, which holds the fog low.
- Fog once filled the Grand Canyon, trapped there by cool air near the ground.
Questions kids ask
Is fog the same as a cloud?
Yes. Fog is a cloud that touches the ground instead of floating high in the sky.