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    National Park Service
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    In this online interactive, learners investigate fires, particularly the causes and behavior of forest fires, as well as how the National Park Service deals with fires. Learners modify conditions ...

    free Ages 6 - 14 5 to 10 minutes
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    National Park Service
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    In this online interactive, learners explore the various types of life that live in fresh water systems and how the presence of these organisms is an indication of the overall health of the water....

    free Ages 8 - 14 10 to 30 minutes
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    National Park Service
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    In this online interactive, learners measure time using the growth rings of trees. This resource explains the meaning of growth and rest bands, the causes of variations in "tree calendars,...

    free Ages 6 - 14 5 to 10 minutes

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