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Washington Air National Guardsmen methodically make their way through the mud and wreckage left behind by Saturday's mudslide near Oso, Wash., Friday, March 28, 2014. More than 70 guardsmen have been activated to support the search and rescue efforts.(AP Photo/Washington National Guard, Spc. Matthew Sissel, 122D PAOC)
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In this photo taken July 18, 2008, and provided by the U.S. Geological Survey, Lindsay Shirk, at the time a student at Delaware Valley College, collects soil in Wyoming. The federal government sent students and scientists to more than 4,800 places across the nation to collect soil that was analyzed for its composition. The results are now highly sought after by researchers in a wide variety of fields. (AP Photo/U.S. Geological Survey)
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In this photo taken June 2, 2010, and provided by the U.S. Geological Survey, Jazelle Mondeau, at the time a student at University of Arizona, collects soil in the Texas Panhandle. The federal government sent students and scientists to more than 4,800 places across the nation to collect soil that was analyzed for its composition. The results are now highly sought after by researchers in a wide variety of fields. (AP Photo/U.S. Geological Survey)
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In this photo taken June 1, 2010, and provided by the U.S. Geological Survey, Joseph Daniel, at the time a student at North Carolina State University, collects soil in Southern California. The federal government sent students and scientists to more than 4,800 places across the nation to collect soil that was analyzed for its composition. The results are now highly sought after by researchers in a wide variety of fields. (AP Photo/U.S. Geological Survey)
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In this photo taken Sept. 11, 2008, and provided by the U.S. Geological Survey, geologist Helen Folger of the U.S. Geological Survey collects soil in West Virginia. The federal government sent students and scientists to more than 4,800 places across the nation to collect soil that was analyzed for its composition. The results are now highly sought after by researchers in a wide variety of fields. (AP Photo/U.S. Geological Survey)
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In this photo taken April 16, 2008, and provided by the U.S. Geological Survey, geologist Jim Kilburn, now retired from the U.S. Geological Survey, collects soil from Kansas. The federal government sent students and scientists to more than 4,800 places across the nation to collect soil that was analyzed for its composition. The results are now highly sought after by researchers in a wide variety of fields. (AP Photo/U.S. Geological Survey)
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In this March 20, 2014 photo, Scott Harris, center, an associate professor in the department of geology and environmental geosciences at the College of Charleston, deploys a sidescan sonar unit with two students from the college from the back of the research vessel Savannah in Charleston Harbor in Charleston, S.C. Students aboard the vessel completed several days of mapping the mid-intercontinental shelf off South Carolina. (AP Photo/Bruce Smith)
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In this March 20, 2014 photo, a map of the ocean floor along the mid-continental shelf off South Carolina is displayed on a computer aboard the research vessel Savannah in Charleston Harbor in Charleston, S.C. College of Charleston students aboard the vessel completed several days of mapping the ocean bottom off South Carolina. The winding areas on the map that resemble rivers are channels carved in prehistoric times when sea level was lower and the coastline farther east than it is now. (AP Photo/Bruce Smith)
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In this March 20, 2014 photo, Leslie Sautter, an associate professor in the department of geology and environmental geosciences at the College of Charleston shows a map of the waters off South Carolina aboard the Research Vessel Savannah in Charleston Harbor in Charleston, S.C. Students aboard the vessel completed several days of mapping the mid-intercontinental shelf off South Carolina. (AP Photo/Bruce Smith)
