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    Colorado State University
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    This demonstration/activity helps learners understand why higher elevations are not always warm simply because "hot air rises." Learners use a tire pump to increase the pressure and...

    $1 - $5 per group Ages 8 - 18 10 to 30 minutes
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    Twin Cities Public Television
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    In this online Flash game, learners take to the skies in a hot air balloon and are challenged to beat other balloonists' times to the finish line without crashing. Learners use their knowledge...

    free Ages 6 - 14 5 to 10 minutes