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June 30, 2016

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The white "bathtub" ring at Lake Mead is viewed from a Southwest Airlines passenger jet Monday, Aug. 18, 2014. The bathtub ring of light minerals shows the high-water mark of 1983.

Steve Marcus

The white "bathtub" ring at Lake Mead is viewed from a Southwest Airlines passenger jet Monday, Aug. 18, 2014. The bathtub ring of light minerals shows the high-water mark of 1983.