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The United States Geological Survey and agencies from four states recently announced low-level airplane flights in the Central Great Plains. Scientists from Iowa, Minnesota, South Dakota and Nebraska are partnering to image geology using airborne geophysical technology. The aircraft and crews being used are currently being flown out of the O'Neill Airport. The geophysical survey will focus on the buried Spirit Lake tectonic zone, centered in the area between Sioux Fall sand Omaha. The region is...