In this undated photo provided by NASA, a satellite captures the Railroad Valley (RRV), a dry lakebed in Nevada, for conducting ground-based calibration of Earth-observing satellite instruments. At the request of NASA, U.S. land managers have withdrawn about 36 square miles of federal land otherwise open to mineral exploration and mining at the site 250 miles northeast of Las Vegas. Nevada Republican Rep. Mark Amodei has introduced legislation that would rescind the land withdrawal and potentially reopen it to mining. (NASA via AP)
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