20 points
If you examine a piece of hail, it might have invisible layers like an onion.
Which answer best explains why this is true?
O
As hail falls, it picks up layers of dust and dirt from the air.
Hail forms layers because it melts as it falls towards the Earth.
O
Air pressure increase while the hail falls and it causes ice layers to form.
Hail builds up ice layers as it travels through updrafts in a storm before it falls.

Hail builds up ice layers as it travels through updrafts in a storm before it falls.

Explanation:

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.