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    National Health Museum
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    In this activity, learners receive a labeled plastic film canister containing a material representing a pollutant (i.e. pencil shavings = a beaver's wood chips). The instructor (or a learner)...

    $10 - $20 per group Ages 8 - 18 45 to 60 minutes
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    EPA
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    In this activity, learners investigate how increased carbon dioxide (CO2) emissions from the burning of fossil fuels is changing the acidity (pH) of the ocean and affecting coral reefs and other...

    $5 - $10 per group Ages 11 - 14 45 to 60 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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    NOAA
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    In this activity, learners explore the factors that tend to resist changes in pH of the ocean and why the ocean is becoming more acidic. This lesson guides inquiry into some properties of the ocean...

    Over $20 per group Ages 14 - 18 1 to 2 hours