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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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    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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    COSI
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    In this environmental science activity (page 4 of the PDF), learners use vinegar and chalk to observe the effect of acid rain on various building materials and plant life. Learners will explore how...

    $1 - $5 per group Ages 6 - 14 4 to 24 hours
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    Twin Cities Public Television
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    In this activity (page 2 of PDF under GPS: Cave Swallows Activity), 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,...

    $1 - $5 per group Ages 8 - 14 30 to 45 minutes
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    Lunar and Planetary Institute
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    In this activity, learners create volcanoes like those they have examined on Earth and Mars through images taken by spacecraft. Using baking soda and vinegar, learners model volcanic eruptions and...

    $10 - $20 per group Ages 8 - 14 10 to 30 minutes
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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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    The Exploratorium
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    In this activity, learners try to figure out who has their matching rock type by reading a description of their rock (no talking!). This activity can be used in a variety of ways: to introduce...

    $10 - $20 per group Ages 8 - 18 45 to 60 minutes
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    The Exploratorium
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    In this activity, learners calculate the percentage of oxygen in the atmosphere by using steel wool's ability to rust. Learners measure the volume of a test tube with a small amount of steel...

    1 cent - $1 per student Ages 11 - 18 1 to 7 days
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    Minnesota Zoo
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    This activity introduces learners to wolf behavior and communication. Learners explore how wolves communicate with each other by using their sense of smell to identify members of their "pack....

    Over $20 per group Ages 6 - 11 10 to 30 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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