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    National Park Service
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    In this online interactive, learners investigate "The Case of the Disappearing Dark Sky." Learners discover how human development leads to fewer visible stars as well as the effects of...

    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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