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    The Exploratorium
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    This activity provides instructions for learners to create models of the Earth and then to model a "day" on Earth as well as modeling the seasons. Parent web site about ancient...

    $5 - $10 per group Ages 11 - 14 45 to 60 minutes
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    The Exploratorium
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    Did you know that you would be a different age if you lived on Mars? It's true! In this activity, you'll learn about the different rotation and revolution periods of each of the planets...

    free Ages 8 - 18 10 to 30 minutes
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    The Center for Science Education @ Space Sciences Laboratory, UC Berkeley
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    In this activity, learners verify that the Sun appears in a different location at a specific time every day of the year with one exception: on the Equinoxes. Learners will create a testing device...

    $1 - $5 per student Ages 6 - 14