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 (3.5 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.
This image was acquired by
Landsat 7s Enhanced Thematic Mapper plus
(ETM+) sensor on May 15, 1999. This is a false-color composite image made using shortwave infrared,
infrared, and green wavelengths.