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    Oregon Museum of Science and Industry
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    This display shows slow chemical reactions in colorful crystal formations known as Liesegang Rings. These reactions are similar to those forming the rings in agates. This activity is recommended...

    $5 - $10 per student Ages 14 - adult 1 to 4 weeks
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    Oregon Museum of Science and Industry
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    Learners combine different plant solutions -- made from fruits, vegetables, and flowers -- with equal amounts of vinegar (acid), water (neutral), and ammonia (base). They compare the color changes...

    1 cent - $1 per group Ages 11 - adult Under 5 minutes
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    Science Museum of Minnesota
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    The Sacred Cenote at Chichén Itzá is a sink hole, or well, containing groundwater. In this activity, learners create their own cenote using chalk, limestone, acids, and rain water. A real cenote is...

    1 cent - $1 per student Ages 6 - adult 10 to 30 minutes
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    The Oceanography Society
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    The objective of this inquiry-based lesson is for learners to gain an understanding of how increasing ocean acidity can affect the calcification of marine organisms. During this activity, learners:...

    Over $20 per group Ages 14 - adult 2 to 4 hours