2015年12月28日星期一

Boulders on a Martian Landslide


The striking feature in this image, acquired by the HiRISE camera on NASA's Mars Reconnaissance Orbiter on March 19, 2014, is a boulder-covered landslide along a canyon wall. Landslides occur when steep slopes fail, sending a mass of soil and rock to flow downhill, leaving behind a scarp at the top of the slope. via NASA http://ift.tt/1ZxnSsx

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