Book 7, Question 5
Why Does Fog Hug the Ground?
Fog is simply a cloud that touches the ground. It forms when the air near the ground cools enough for invisible water vapor to turn into tiny droplets. That is why you can walk right inside it.
More fun facts
- Radiation fog, also called ground fog, is common everywhere, especially in autumn.
- Advection fog forms on the Pacific coast when warm, moist air blows over cold ocean water, then drifts inland.
- Precipitation fog forms when rain falls through cold air.
- Steam fog is often seen over the Great Lakes.
- In ground fog, a thin layer of warm, moist air sits near the ground with cooler, drier air on top of it.
- You can make a small fog of your own inside a bottle by changing its temperature, a NOAA activity shows.
Questions kids ask
Is fog a cloud?
Yes. Fog is a cloud that forms just above the ground.
Where does advection fog happen?
Along the Pacific coast, when warm, moist air blows over cold ocean water.