Multiple Generations of Dark Slope Streaks on a Crater in Arabia Terra This image is of a crater in Arabia Terra, which is a large swath of bright (high albedo) terrain in the Martian cratered uplands. The steep interior walls of the crater are covered with numerous slope streaks, thought to be caused by dust avalanches that strip away layers of dust to reveal a darker underlying surface.
Gullies and Seasonal Frost in a Crater This scene shows the curving, Eastern interior walls of a 12 kilometer-diameter (approximately 7.4 mile-diameter) impact crater in the Southern mid-latitudes of Mars.
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Fall in Hellas Basin It is now fall in the southern hemisphere and in the giant impact crater known as Hellas basin small boulders cast long shadows. The long shadows emphasize small scale topographic features. Wind erosion is responsible for much of the morphology in this region. #Mars
Dark and light streaks crawl up a ridge in this picture of the Acheron Fossae region. Scientists debate over how the different-colored streaks formed, but they agree that the darker streaks are younger that turn into the lighter streaks over time.