READING TOPOGRAPHIC MAPS LAB
PROBLEM: How are topographic maps used to show differences in elevation?
BACKGROUND INFORMATION: People use different kinds of maps to find out different
kids of information. A topographic map is a flat map that can be used to show elevation. A
mountain, for example, on a topographic map is drawn as a series of curved loops, on loop inside
the other. Each loop is called a contour line. Each contour line passes through areas of equal
elevation. Sometimes the contour lines have smaller lines extending inward. These lines are
called hachures and indicate that the elevation is decreasing, not increasing. These are used to
show a depression or hole. Relief indicates variations in elevation above sea level. Contour lines
close together show steep terrain or high relief – High mountain peaks and ridges. Contour lines
spaced apart show slight change in elevation or low relief – Low, flat land area.
RULES TO REMEMBER!!
 Contour lines connect points of equal elevation.
 Contour interval is the difference between two contour lines.
 Contour lines can NEVER cross or touch.
 Elevation is the distance above or below sea level. (Sea level = 0)
HYPOTHESIS:
MATERIALS: Topographic Map of Enchanted Rock
PROCEDURE: Use the topographic map of Enchanted Rock to answer the following questions.
OBSERVATIONS:
1. What is the contour interval for this map? (do not define)
2. What is the approximate elevation of Little Rock?
3. What is the maximum possible elevation of Buzzards’ Roost?
4. What is the elevation the bench mark on Enchanted Rock?
5. Approximately how long is the access trail to the Scenic Overlook?
6. If you are at the top of Enchanted Rock, approximately how far is it to the nearest
primitive toilet?
7. In what area on the map is the depression located?
8. What is the approximate elevation at the bottom of the depression?
9. Which is higher in elevation, Turkey Peak or Freshman Mountain?
10. Which trail has the steeper slope, Echo Canyon or Summit Trail?
CONCLUSION: