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    In this activity, learners are introduced to tree rings by examining a cross section of a tree, also known as a “tree cookie.” They discover how tree age can be determined by studying the rings and...

    1 cent - $1 per group Ages 8 - 18 45 to 60 minutes
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    In this activity (Lesson 1), learners work in groups to create tide simulations. Learners develop a testing procedure, detail their work in a Laboratory Report, illustrate their simulation and...

    $1 - $5 per group Ages 8 - 14 45 to 60 minutes

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