Question

subtract the elevation of point a from point b. what is the change in elevation?

Explanation:

Step1: Identify elevation of point A

Point A is on 400 - m contour line, so elevation of A = 400 m

Step2: Identify elevation of point B

Point B is on 800 - m contour line, so elevation of B = 800 m

Step3: Calculate change in elevation

Change in elevation = Elevation of B - Elevation of A = 800 - 400

Answer:

400 m