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On the border between Chile and the Catamarca province of Argentina lies a vast field of currently dormant volcanoes. Over time, these volcanoes have laid down a crust of magma roughly 2 miles (3.2 km) thick. It is tinged with a patina of various colors that can indicate both the age and mineral content of the original lava flows. Image acquired by Landsat 7 on May 1, 1999. [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.]