Class Update: February 20, 2004
Does the Third Set Say More?
Your secret Mystery Friends have provided their third set of sunrise/sunset data for you. Will your photoperiod graph this week reveal anything more about where they might be hiding?
Their latest sunrise/sunset times are provided in today's report on the Web.
More Than Daylength Is Changing
As you plot the changing daylength on your graphs, keep in mind that sunlight affects all living systems. The sun is at the base of the food chain. Sunlight makes plants grow, animals eat these plants, predators prey on these animals, and so forth.
As daylength changes at the Mystery Classes around the planet, stop to think about how the food chain is changing too. For example, during spring in the Northern Hemisphere, sunlight and photosynthesis increase, temperatures rise, and food production increases. The animal movements you track and the signs of spring you witness will be related to daylight in one way or another.
This Week's Sunrise/Sunset Times
Remember, the secret Mystery sites recorded their times last Monday, the same day you collected your own local sunrise/sunset data.
Note to Teachers: Plan Ahead and Mark Your Calendars
Here's the 2004 Mystery Class Schedule so you know what to expect from Journey North. Please be sure to plan ahead.
The Next Mystery Class Update Will Be Posted on February 27, 2004
2004 Journey North. All Rights Reserved.