Eroded mountains, satellite image. Ridges of rock (green) and heavily eroded mountain spurs (grey) are seen in this image. The ridges show both the rock layers (strata) and the twisted patterns that formed as tectonic forces buckled the Earth's crust. Varying resistance to later erosion has now revealed these strata. Deeply etched valleys are seen on the sides of the mountain spurs. These are part of the Sierra Madre Oriental mountain range, and this image was taken on the border between the Coahuila and Nuevo Leon provinces of Mexico. Image taken on 28 November 1999, in visible and infrared wavelengths, by the Enhanced Thematic Mapper Plus (ETM+) sensor on NASA's Landsat 7 satellite.
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