CLEAN UP OF BRONX PARK

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Bronx middle school students volunteer their time in Bronx Park in New York on Tuesday, April 13, 2010.  The students  test the water quality of the Bronx River   using the Winkler titration method to measure the dissolved oxygen in the water.  (© Frances M. Roberts)
Bronx middle school students volunteer their time in Bronx Park in New York on Tuesday, April 13, 2010. The students test the water quality of the Bronx River using the Winkler titration method to measure the dissolved oxygen in the water. (© Frances M. Roberts)
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