How get the answer tell me if you get the answer

You can get the answer by comparing the graph to the question like in the first one it asks how far above sea level the mountain is and the graph says 2 kilometers which therefore is the answer.

You get the answer on the bar above the question.

the airplane is 4 km above sea level.
the sunken ship is -4km bellow sea level.
the fish is -1km bellow sea level.
the mountain is 2km bellow sea level.