Making Topographic Maps and Mountain Profiles
Jonathan Levin HS for Media and Communications, Bronx
Summer Research Program for Science Teachers
Subject: Earth Science
Aim: How do we mark isolines on our mountains and construct a profile of the mountain?
Objectives: Students will be able to, by hands-on activity, discussion and reading:
Make mountains out of play clay
Mark contour intervals
Draw the profiles of mountatins
Explain the construction and purposes of topographic maps
Introduction: Contour lines are isolines that connect points of equal elevation. In topographic maps, mountains are represented as concentric contour lines with equal intervals. By graphing the contour lines, the profiles of mountains can be rebuilt.
- Container of play clay
- Chart paper
- Color markers
- Contour Map Worksheet
- Profile Grid
Note to the Teacher:
Do Now/Motivation: Answer the following question in the space below.
1. What is an isoline?
Give some examples of
isolines used in different maps.
The teacher will validate the answers of the
The teacher will validate the answers of the Do Now.
Step 1: Build your own mountain using 1 container of play clay.
Step 2: Measure the height of your mountain from its base, in centimeters, using a ruler.
Height of mountain _______ cm.
Divide the height of your mountain by 10. The length of each segment will be ________ cm.
Step 3: Use the length of each segment you got in step 2 to create equal sections from the base to the top of your play clay-mountain by following these steps:
Keep your ruler close to the mountain. Make sure that your ruler (the centimeter side) touches the base and top of your mountain.
You may want to use your pencil to make a mark corresponding to the length of each segment..
Length of each segment_=_________________Centimeters
Scale = ____________ (Express the value of your segment length in meters)
Step 4: Use a piece of string to cut off the top section. Place it in the rectangle on your worksheet (Appendix 1) and carefully trace its outline. Now cut the next portion from the top. Continue cutting and tracing until you have reached the base of the mountain. By now, you must have traced all the segments of the mountain as a topography map. Mark the peak of your mountain with an X.
Question: What is the name of the map you have got by tracing the mountain?
Step 5: Please put the play clay back into the container, close its lid and clean up your desk.
Step 6: Using a ruler, draw a straight line AB across the concentric contour lines with its end points A and B on the first (base) contour line. An example is shown below:
Step 7: Keep a strip of paper on the line AB of your contour map and mark each of the concentric contour lines as points with their numerical value on the strip of paper.
Step 8: Mark the Y axis of the profile grid (Appendix 2) using the value of your segment length you got in step 2 from the bottom to the top.
Step 9: Put the strip of paper at the bottom of the profile grid and mark the points that correspond to the contour lines of your mountain . Connect the points together to get the profile of the mountain.
Answer the following questions:
1.What kind of contour map did you draw?
2.What do close contour lines represent
3.What are index contour lines?
4. What do hachures represent?
5. How do we determine the direction of flow of a river from a contour map?
New York State Standards:
2.1q Topographic maps represent landforms through the use of contour lines that are isolines connecting points of equal elevation. Gradients and profiles can be determined from changes in elevation over a given distance.