The overall blue tone in the image may be due to an expansion of grass or shrub vegetation in a senesced state resurfacing with different materials. There is an overall change in brightness which may be due to an overall difference in moisture content of the surfaces.

U.S. Department of the Interior | U.S. Geological Survey
URL: http://geochange.er.usgs.gov/sw/changes/anthropogenic/vegas/vchange.html
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Page Last Modified: Tue 18-May-2004 17:00:34 MDT
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