Question

use figure 4 below to answer questions 7-11. a spot elevation is shown as a reference. a rive shown with the dashed line. this map has a contour interval of 20 meters.

1. label each contour line on figure 4 with its elevation in meters. write the elevation on each line.

figure 4: topographic map with a 20-meter contour interval

Explanation:

Step1: Identify reference elevation

Spot elevation = 270 meters

Step2: Analyze contour interval

Contour interval = 20 meters

Step3: Label line B (next to spot)

Line B is at the same elevation as the spot: $270$ meters

Step4: Label line A (uphill from B)

Add 20m to B's elevation: $270 + 20 = 290$ meters

Step5: Label line F (uphill from A)

Add 20m to A's elevation: $290 + 20 = 310$ meters

Step6: Label line E (uphill from F)

Add 20m to F's elevation: $310 + 20 = 330$ meters

Step7: Label line C (downhill from B)

Subtract 20m from B's elevation: $270 - 20 = 250$ meters

Step8: Label outer D line (uphill from C)

Add 20m to C's elevation: $250 + 20 = 270$ meters

Step9: Label middle D line (uphill from outer D)

Add 20m to outer D: $270 + 20 = 290$ meters

Step10: Label inner D line (uphill from middle D)

Add 20m to middle D: $290 + 20 = 310$ meters

Answer:

• Line E: 330 meters
• Line F: 310 meters
• Line A: 290 meters
• Line B: 270 meters
• Line C: 250 meters
• Outer D line: 270 meters
• Middle D line: 290 meters
• Inner D line: 310 meters