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    Pratt School of Engineering, Duke University
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    Historically, sea floor mapping (bathymetry) was done by soundings. Soundings are taken by dropping a weight with a pre-measured rope off the side of the boat and noting the measurement on the rope...

    $1 - $5 per group Ages 11 - 14 2 to 4 hours
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    Twin Cities Public Television
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    In this online Flash game, learners will explore a coral reef using an underwater remotely operated vehicle (ROV). Faced with concerns that environments around the world might be undergoing rapid...

    free Ages 6 - 14 5 to 10 minutes
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    Children's Museum of Indianapolis
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    In this archaeology activity, learners make observations and conduct an experiment to demonstrate the effect saltwater has on artifacts. Use this activity to introduce learners to the process of...

    $10 - $20 per group Ages 8 - 14 1 to 7 days
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    Children's Museum of Indianapolis
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    In this archaeology activity, learners consider ways in which excavating an underwater site is different from excavating a terrestrial site. Through experimentation, learners discover new...

    $5 - $10 per group Ages 8 - 14 45 to 60 minutes
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    Science Museum of Minnesota
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    Using simple materials, learners build an underwater scope to observe what lives in rivers, lakes, and streams. Since people can't breathe under water, the world below the water remains a...

    1 cent - $1 per student Ages 6 - 14 45 to 60 minutes
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    Lawrence Hall of Science
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    In this outdoor activity, learners go "can fishing" and discover the kinds of aquatic organisms that live in and on submerged cans. Discarded bottles and cans surprisingly provide...

    $10 - $20 per group Ages 8 - 18 45 to 60 minutes
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    American Educational Products
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    In this activity, learners create a map of a hidden surface using a "sounding stick" -- a technique similar to how underwater maps were once made. The hidden surface is created using...

    Over $20 per group Ages 4 - adult 10 to 30 minutes
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    Twin Cities Public Television
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    In this quick activity (page 1 of the PDF), learners will build a simple Cartesian Diver in an empty 2-liter bottle. Use this activity to demonstrate the principle of buoyancy, similar to the...

    1 cent - $1 per group Ages 8 - 14 10 to 30 minutes