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But InSight’s landing place turned out to have cohesive soil, in which the particles stick together more like in a vat of flour, says Tilman Spohn, a space scientist at the German Aerospace Center in Cologne, Germany.

Nothing more effectually disintegrates a cohesive soil than freezing and thawing, and the surface of earth which has just undergone those processes is more subject to erosion by running water than under any other circumstances.