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    California Academy of Sciences
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    In this activity, learners gain knowledge about how carbon moves through all four of the Earth’s major spheres (biosphere, hydrosphere, atmosphere, and lithosphere), and understand how humans...

    1 cent - $1 per group Ages 8 - 18 30 to 45 minutes
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    PhET
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    In this online activity, learners build their own system of heavenly bodies and watch the gravitational ballet. With this orbit simulator, learners can set initial positions, velocities, and masses...

    free Ages 11 - adult 10 to 30 minutes
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    Lawrence Hall of Science
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    En esta actividad, Mateo y Cientina enseñan a usar modelos para ver las causas de las fases lunares. Usando un foco de lámpara, una naranja y sus cabezas para representar el sol, la luna y la...

    free Ages 8 - 14 5 to 10 minutes
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    American Chemical Society
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    In this activity (on page 8), learners model how marble statues and buildings are affected by acid rain. Antacid tablets made with calcium carbonate are used to represent marble (also made from...

    1 cent - $1 per student Ages 6 - 14 10 to 30 minutes
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    Twin Cities Public Television
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    In this ocean engineering activity, learners explore buoyancy and water displacement. Then, learners design models of deep sea divers that are neutrally buoyant.

    $1 - $5 per group Ages 8 - 14 45 to 60 minutes
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    WGBH
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    In this design challenge activity, learners build a boat that can hold 25 pennies (or 15 one inch metal washers) for at least ten seconds before sinking. This competitive, hands-on activity...

    $1 - $5 per student Ages 8 - 14 30 to 45 minutes