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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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    U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy
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    In this activity, learners work in groups to build simple solar stills filled with salt water. After the stills are complete, learners observe what happens when they place the stills in the sun....

    1 cent - $1 per group Ages 4 - 11 45 to 60 minutes