Abby fills a graduated cylinder with 3 mL of water. She then drops a small rock into the cylinder, and the water
level rises to the 5 mL mark. What is the volume of the
rock?

Volume of the rock, V = 2 mL

Explanation:

It is given that,

Water filled in a graduated cylinder is 3 mL

She  then drops a small rock into the cylinder and the water  level rises to the 5 mL mark

We need to find the volume of the rock.

The volume of the rock is equal to the difference in volume mark. So,

V = 5 mL - 3 mL

V = 2 mL.

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.