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    NOAA
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    In this experiment, learners will investigate the release of carbon-containing gas from living and nonliving sources. Learners scratch the surface of a limestone rock and observe what happens when...

    $1 - $5 per student Ages 8 - 14 45 to 60 minutes
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    Twin Cities Public Television
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    In this activity (page 2 of PDF), learners will model how caves are formed by placing one piece of chalk in a cup of vinegar and another piece in a cup of water, then watch and record their...

    $1 - $5 per group Ages 8 - 14 30 to 45 minutes
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    COSI
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    This is a chemistry lab activity about solutions (page 7 of the PDF). Learners see firsthand how chemicals in a solution can combine to form an entirely different substance. They also see physical...

    $1 - $5 per student Ages 8 - 18 10 to 30 minutes