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        Drought And Climate Change Threaten Colorado River Basin | Human Impact on the Physical Environment | Geography

        PAGE, AZ - MARCH 24: The lake side of Glen Canyon Dam shows a100-foot thick 'bathtub ring' of bleached sandstone on Lake Powell, the result of a six-year drought that has dramatically dropped the level of the reservoir, on March 24, 2007 near Page, Arizona. Lake Powell and the next biggest Colorado River reservoir, the nearly 100-year-old Lake Mead, are at the lowest levels ever recorded.

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