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4-6

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Part of Dragonfly TV
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Water Testing

How clean is your water? Meet some smart kids in Queens, New York who are answering just that question at the Alley Pond Environmental Center. After collecting water samples, they measure the temperature and test the oxygen and nitrate content. The resulting data tells them how hospitable the water is for fish as well as the overall health of the aquatic ecosystems.

http://pbskids.org/dragonflytv/

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