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    The Exploratorium
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    In this geology activity, learners create a model using a mixture of salt and sand inside a CD case. When the case is tilted or inverted, the mixture dramatically sorts into a layered pattern. With...

    $5 - $10 per group Ages 11 - 18 1 to 2 hours
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    The Exploratorium
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    This activity shows you how to make amazing crystal spikes using Epsom salt and the sun. When Epsom salt is dissolved in water and placed in a container in the sun, the water evaporates, leaving...

    $1 - $5 per student Ages 6 - 11 1 to 2 hours
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    Centers for Ocean Sciences Education Excellence
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    In this activity, learners explore the concept of density-driven currents (thermohaline circulation) and how these currents are affected by climate change. Learners use colored ice cubes, water,...

    $10 - $20 per group Ages 8 - adult 1 to 2 hours
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    New England Aquarium
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    In this activity, learners explore how salt water freezes in comparison to fresh water. Use this experiment to consider how pond animals survive cold winters in comparison to animals that live in...

    1 cent - $1 per group Ages 6 - 14 1 to 2 hours
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    The Exploratorium
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    In this activity, learners conduct an oxidation experiment that turns old pennies bright and shiny. Learners soak 20 dull, dirty pennies in a bowl of salt and vinegar for five minutes. They rinse...

    $1 - $5 per group Ages 8 - 14 1 to 2 hours
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    Lawrence Hall of Science
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    In this outdoor activity, learners visit the intertidal zone of a rocky coastal site well populated with marine organisms. During a low tide, when many organisms are not covered by water, learners...

    $10 - $20 per group Ages 8 - 18 1 to 2 hours
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    Bridge: Online Ocean Science Education Resource Center
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    Water, whether fresh or salty, serves as one of the best electrical conductors on the planet. Does salt effect its conductivity? In this activity, learners will explore the effects of salts in the...

    free Ages 14 - 18 1 to 2 hours
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    The Exploratorium
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    In this activity, learners build a simple qualitative conductivity tester with a battery, bulb and foil. Then learners use the device to test if a solution, a series of solutions, and a solution...

    $5 - $10 per student Ages 11 - 18 1 to 2 hours
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    Biotechnology and Biological Sciences Research Council
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    In this activity (p.6-7 of PDF), learners investigate the evolution of wheat by creating dough from different flours, observing the samples of dough as they rise, and then baking the dough. The...

    $10 - $20 per group Ages 8 - adult 1 to 2 hours
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    Biotechnology and Biological Sciences Research Council
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    In this activity (page 5), learners investigate the evolution of wheat by washing different types of dough with water and comparing the results. The evolution of wheat from wild grasses...

    $10 - $20 per group Ages 8 - adult 1 to 2 hours

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