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Ground Water May Contain Decades Old Contamination
Nitrogen and phosphorus are the two plant nutrients in sewage and fertilizer that foul the bay, feeding its algae blooms and "dead zones." Both are washed off the land into streams whenever it rains, but nitrogen dissolves in water, so it also soaks down into the soil, ultimately reaching the water table.

Using a computer model to simulate ground-water flows, USGS scientists found that when nitrogen from fertilized farm fields soaks into the ground, it takes 20 to 40 years on average for the nutrient-laden water to make its way underground into streams and rivers.

 
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Shrinking of Lake Chad Turning Farmland into Desert - From droughts to floods, life in Africa's Sahel belt can be a constant struggle, For the more than 20 million people living in the region though, the shrinking of Lake Chad, the most reliable source of freshwater, is threatening their very survival.


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