Topographic Map LabTopographic Map Lab

SWBAT draw and interpret a SWBAT draw and interpret a topographic maptopographic map

BackgroundBackground• Contour lines, as visualized on the earth’s

surface, are closed curves at constant elevation, which are always perpendicular to the slope of the surface at any point. Since a contour line might actually close only after wandering a large geographical region, contour lines on a map might not seem to close. Each contour line has an expressed or implied elevation, and the interval between lines is constant. Closely spaced contour lines indicate a step slope. Streams or rivers are distinguished by a consistent dip in the contour lines.

ProcedureProcedure• Using tape, secure the mountain replica to the

bottom of the box• Mark the side of the box in centimeter

increments• Carefully fill the box with water until you hit the

first mark• Place the lid on the box and place the acetate

sheet on top of it• Draw the resulting “shore line” on the acetate

sheet from above• Repeat the steps until you have reached the top

of the box

QuestionsQuestions• Staple or tape the contour map into your lab

book and answer the following questions– Describe the general shape of the contour lines.– What general statement can be made about the

closeness of the lines and steepness of the slope?– Describe how the solidified lava flows have affected

the pattern of contour lines.– How would a steep valley down the side of the

volcano change the contour pattern?– Would it be possible to distinguish a basin form a

mountain on a topographic map or chart?