On a warm, pleasant day, you notice some clouds in the sky. The clouds are very high up in the sky and look quite thin. Which type of clouds are in the sky?

Cumulonimbus clouds

Explanation:

"Cumulonimbus clouds grow on hot days when warm, wet air rises very high into the sky. From far away, they look like huge mountains or towers."

https://scijinks.gov/clouds/#:~:text=Cumulonimbus%20clouds%20grow%20on%20hot,like%20huge%20mountains%20or%20towers.

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answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.