Department of Earth Science |Northeastern Illinois University

INTRODUCTION TO EARTH SCIENCE
ESCI 121, Fall 2006

Daily Objectives #23  (November 14, 2006)                                                                        Dr. Sanders

Homework #4 is due at class time next Tuesday, November 21.
To view it, go to the course home page and click the yellow box labeled "Homework".

By the end of today's class, you should be able to do the following:

* Maps:  List the common elements that should appear on any map, and explain how to use and/or interpret them.
scale               north arrow               coordinate system               key/legend               title

* Topographic maps: explain what a contour line on a topographic map represents; tell what contour interval means and how to determine what the contour interval is on any given topographic map.

* Using the principles of contouring, participate in the following three exercises (we will split into groups and rotate around to each activity):

 ACTIVITY ONE Crease a sheet of paper and stand it up on your desk like a tent.  Using the principles of contouring, draw the contour lines that would appear on it.  Then, draw the map that would illustrate those contours.  Flip the paper upside down so it forms a "V".  Draw the equal elevation contours and map.  Start with a fresh piece of paper, crease it, and prop one end of it on a book so it forms a tilted tent.  Draw the topographic contours and map.  Finally, flip the paper upside down so it forms a "V", tilt it, and draw the contours and map.

 ACTIVITY TWO Sketch a topographic map of the area carved in the sand on the stream table.  When you are done, have the instructor check your map. Then, construct a new shape in the sand for another group to map.  Make a map of this area too—yours will be the “answer key”.

 ACTIVITY THREE Using the topographic quadrangles of Chicago Loop and Palos Park, find a place that illustrates the following features.  Label and place sticky notes on the map to indicate the location of each feature. * a gentle slope   * a steep slope   * a closed depression   * a round hill top   * a ridge (elongated hilltop)   * a lake * a benchmark * a stream; find two places where contour lines cross the same stream and put sticky notes on the map to show both places.  Tell what direction the stream is flowing. * a “Gaging Station” along a stream      * a forested or undeveloped area (how can you tell?) * an urban area (how can you tell?)

Department of Earth Science | Northeastern Illinois University

© 2006 Laura L. Sanders.  Last updated November 14, 2006.