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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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    Twin Cities Public Television
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    In this activity (page 2 of PDF), 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, then watch and record their...

    $1 - $5 per group Ages 8 - 14 30 to 45 minutes
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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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    NOAA
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    In this experiment, learners will investigate the release of carbon-containing gas from living and nonliving sources. Learners scratch the surface of a limestone rock and observe what happens when...

    $1 - $5 per student Ages 8 - 14 45 to 60 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 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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    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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    Science Friday
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    In this activity, learners perform an experiment to find out what determines a flower's color. Learners extract petal juice, use acid and base indicators, and observe chemical reactions to...

    $10 - $20 per group Ages 11 - 14 45 to 60 minutes
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    University of Washington
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    In this activity, learners use earthworms as "unknown creatures" from the South American jungle to find out how animals use senses. Learners are given supplies to devise their own...

    1 cent - $1 per student Ages 8 - 18 45 to 60 minutes

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