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Q1. How is fog formed?

Q2. Who plays an important role to bring back water to surface of earth?

Fog is formed due to sudden dip in temperature. The water vapour condense and collect as tiny droplets of water near the Earths surface. They do not fall down as the pressure is low due to cold. Sometimes condensation can happen around dust particles or pollen or other impurities, hindering the vision called as smog.

Sun plays a key role in bringing water back to Earth.

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Fog is formed when there is a sudden fall in temprature, the water vapour present in the air condenses and begins to change into tiny droplets of water. A collection of these water droplets that float in the air near the ground is called fog. 

 

And about your 2 nd question i don't know

U can search that from google :)

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1) Fog forms when water vapour in the air begins to condense into liquid water. Normally fog forms at a relative humidity of 100%. Fog formation requires the condensation nuclei. The dust, aerosol or pollutants present in air will act as the condensation nuclei.

2) Water evaporates to form clouds and the come back to the surface of the eath by the process of precipitation during watercycle.

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 1) Fog forms when water vapour in the air begins to condense into liquid water. Normally fog forms at a relative humidity of 100%. Fog formation requires the condensation nuclei. The dust, aerosol or pollutants present in air will act as the condensation nuclei.

2) Water evaporates to form clouds and the come back to the surface of the eath by the process of precipitation during watercycle.

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