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In a small corner of the vast Great Sandy Desert in Western Australia, large sand dunes --the only sand in this desert of scrub and rock -- appear as lines stretching from left to right. The light-colored fan shapes are scars from wildfires. Landsat image taken 8/22/2000. [Source Images for earth energy mandalas and geographical information courtesy of U.S.Geological Survey National Center for EROS (Earth Resources Observation and Science) and NASA Landsat Project Science Office.]