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The folds, compressional ridges and flow lines on this debris-covered glacier on Mars are strikingly similar to the appearance of features on Sourdough Peak. Planetary scientists often turn to "Earth analogs" to understand what shapes landscapes on other (Photo: Eric Petersen/HiRISE) The folds, compressional ridges and flow lines on this debris-covered glacier on Mars are strikingly similar to the appearance of features on Sourdough Peak. Planetary scientists often turn to "Earth analogs" to understand what shapes landscapes on other planets.