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Resembling splotches of yellow and green paint, salt-encrusted seasonal lakes dot the floor of Western Australia’s Shoemaker impact structure. The structure was formed about 1.7 billion years ago and is currently the oldest known impact site in Australia. Acquired May 2nd, 2000 by Landsat 7 satellite. [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.]