The weather map shows the weather conditions for one day across the United States. Based on the weather map, which city will most likely experience heavy rainstorms during the next 24 hours?

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.

thats how its supposed to be