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    Educational Development Center, Inc.
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    In this indepth hands-on activity, learners build a structure that allows them to observe the growth of roots and the correlation between root growth and stem extension. Because no dirt is used in...

    $10 - $20 per group Ages 8 - 14 1 to 4 weeks
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    Twin Cities Public Television
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    This activity (located on page 3 of the PDF under GPS: Temperate Rain Forest Activity) is a full inquiry investigation into tree growth rates. Groups of learners will count tree rings to determine...

    $10 - $20 per group Ages 8 - 14 45 to 60 minutes