What's the pattern?
An age-old theory about robin migration says that robins arrive in an area when the average temperature is 36 degree F. Is it accurate?

Study the maps:

• What color on the temperature map outlines the areas where it is 30-40°F?
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• Imagine the lines continuing up into Canada. Would the 30-40° color band include the blue sightings in central Canada?
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• What do you predict the maps will look like in 2 weeks?
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• Do you think the theory about migration holds true this week?