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    The Exploratorium
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    Ocean acidification is a big issue due to the amount of carbon dioxide humans release. CO2 in the atmosphere is absorbed into the ocean thus changing its acidity. The more acidic the ocean becomes,...

    $1 - $5 per student Ages 11 - 18 10 to 30 minutes
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    Integrated Teaching and Learning Program, College of Engineering, University of Colorado at Boulder
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    Through discussion and hands-on experimentation, learners examine the geological (ancient) carbon cycle. They investigate the role of dinosaurs in the carbon cycle and the eventual storage of...

    $1 - $5 per group Ages 11 - 14 45 to 60 minutes
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    Lawrence Hall of Science
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    In this easy chemistry activity, learners submerge pennies in different liquids (water, lemon juice, vinegar, liquid hand soap, salt water, and baking soda mixed with water) to observe which best...

    $1 - $5 per group Ages 6 - 11 1 to 7 days