Janelle spots some dolphins in the ocean. Her father draws a diagram to show how far down they can go. How far is this relative to sea level? What would an altimeter read at this depth?

The diagram is missing, so i have attached it.

-1000 ft

Step-by-step explanation:

From the diagram attached, we see that they went 1000 ft below the sea level.

Now an altimeter is used to measure altitude depth of an object relative to a fixed level which in this case the fixed level is the top of sea. Since the depth in this case is below sea level, it will be negative.

Thus,the altimeter will read -1000 ft

you didn't give me the choices, so i will just give you the graph so you can look at your choices and choose the right one.