Questions: Which describes where fog forms? at the ground in the upper atmosphere where the air has very low humidity where the atmosphere contains few particles

Which describes where fog forms?
at the ground
in the upper atmosphere
where the air has very low humidity
where the atmosphere contains few particles

Transcript text: Which describes where fog forms? at the ground in the upper atmosphere where the air has very low humidity where the atmosphere contains few particles

Solution

The answer is the first one: at the ground.

Explanation for each option:

At the ground: This is correct. Fog forms when air near the ground cools to its dew point, causing water vapor to condense into tiny droplets suspended in the air. This typically happens close to the ground, creating a cloud-like appearance at ground level.
In the upper atmosphere: This is incorrect. Fog does not form in the upper atmosphere; instead, clouds form at higher altitudes. Fog is essentially a cloud that forms at the Earth's surface.
Where the air has very low humidity: This is incorrect. Fog forms when the air is saturated or nearly saturated with moisture, meaning high humidity is necessary for fog formation.
Where the atmosphere contains few particles: This is incorrect. Particles in the atmosphere, such as dust or pollution, can actually aid in the formation of fog by providing surfaces for water vapor to condense upon. Therefore, an atmosphere with few particles is less conducive to fog formation.

In summary, fog forms at the ground when the air is saturated with moisture and cools to its dew point.

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