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Spring Journey North?
Imagine drawing the wave of spring at different stages over the next weeks as spring moves across the continent. These lines are called "isopleths." You can see an example to the right which shows places that have the same temperatures on a certain date.
Map the Wave with Mapserver
Display your maps in your Journey North learning center.
"Spring green advances at the average rate of XX miles per week."
Hint: To figure this out, measure the distances between the waves on your map. Then use the map's scale to figure out the actual distances. To get an average, add these up and divide the total miles by the number of lines you drew.