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    Bridge: Online Ocean Science Education Resource Center
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    In this environmental science and data analysis activity, learners work in groups to track a Dead Zone (decreased dissolved oxygen content of a body of water) using water quality data from the...

    free Ages 14 - 18 1 to 2 hours
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    NASA
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    In this activity (on page 142 of the PDF), learners will compare breathing rates before and after hyperventilation to explore how reduced carbon dioxide levels in the blood lower the need to...

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