Kruse Ryan "Dead zones are human-caused. They occur when crop - TopicsExpress



          

Kruse Ryan "Dead zones are human-caused. They occur when crop fertilizer and cow poop, containing high levels of nitrogen and phosphorous, get washed into streams and rivers and out to the ocean. The nutrient-rich farm runoff triggers huge algae blooms. When the algae dies, it sinks down to the bottom of the water. Bacteria living in the water decompose the dead algae, and use up the oxygen. Without enough oxygen in the water, fish and shellfish suffocate and die."
Posted on: Fri, 28 Jun 2013 05:34:48 +0000

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