HiRISE: Boulders in gully alcoves

ESP_039747_1090Gullies are often found on steep slopes. In the winter, this area is covered with a layer of carbon dioxide ice (dry ice). In the spring, when the ice warms up and transitions to gas, it dislodges material on the slope, forming a gully. In general, this process works best on fine material, leaving behind large boulders. These boulders can…[More at link]

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