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    National Park Service
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    In this online interactive, learners explore how archaeologists analyze artifacts to better understand how people lived long ago. Learners learn about the importance of asking good questions and...

    free Ages 6 - 14 5 to 10 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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    National Park Service
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    In this online interactive, learners investigate changes in the environment at various locations across the United States. Investigations of an Alaskan coastal community, the Pika, coral reef...

    free Ages 4 - 14 5 to 10 minutes

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