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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
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    American Museum of Natural History
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    Learners observe two model atmospheres -- one with normal atmospheric composition and another with an elevated concentration of carbon dioxide. These two model atmospheres are exposed to light...

    $5 - $10 per group Ages 14 - 18 45 to 60 minutes
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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