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    NOAA
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    In this quick activity, learners observe how salinity and temperature affect the density of water, to better understand the Great Ocean Conveyor. Learners observe what happens when they add...

    1 cent - $1 per group Ages 6 - 14 5 to 10 minutes
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    NOAA
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    In this activity, learners discover that as the salinity of water increases, the density increases as well. Learners prove this by attempting to float fresh eggs in saltwater and freshwater. This...

    1 cent - $1 per group Ages 6 - 14 5 to 10 minutes
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    The Exploratorium
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    In this geology activity learners build a "squeeze box," which allows them to compress layers of sediment. This is a great way to investigate folding and faulting in the Earth. The...

    $10 - $20 per group Ages 8 - 18 5 to 10 minutes
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    Oregon Museum of Science and Industry
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    In this chemistry demonstration, acid rain is simulated in a petri dish. Sodium sulfite (NaSO3) and hydrochloric acid (HCl) are mixed to create sulfur dioxide gas (SO2), which is a common byproduct...

    $1 - $5 per group Ages 14 - adult 5 to 10 minutes