Question

Where do clouds form? Select three options.

A. at the ground
B. in the upper atmosphere
C. near the Earth’s surface
D. where the air has very low humidity
E. where the atmosphere contains few particles

Answer 1

B

By the upper atmosphere, it is meant the upper atmosphere of the troposphere – the lowest layer of the earth’s atmosphere where weather events occur.

Explanation:

Liquid water first evaporates from the earth’s surface, mostly due to heat energy from the sun. The water vapor cools as it rises into the upper troposphere. This is because the upper atmosphere is cooler. As the water vapor cools, it coalesces into water droplets. These droplets, for them to form a cloud, need seed-like particles – like dust suspended in the atmosphere– to coalescence on. This way, the droplets grow bigger and this is how clouds are formed.  

Learn More:

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Answer 2

Answer:

B DE

Explanation: