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Phytoplankton  
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This activity examines the relationship between carbon dioxide levels in the atmosphere and chlorophyll-a measurements in a watershed. Students analyze and compare two Excel plots-one showing carbon dioxide data values from the Keeling Curve and the... (View More)

Audience: High school
Materials Cost: Free

This self-paced, interactive tutorial explores how biological activity helps to determine vertical nutrient distributions in the ocean, examines why upwelling boosts marine productivity, and considers how various physical forces interact to... (View More)

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