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Cosmic Diary

Wind-exposed layers

26 Mar 2018, 16:30 UTC
Wind-exposed layers NASA/JPL/Univ. of Arizona

On Earth, layers comprising the geological record of an area are most often exposed by fluvial erosion, as a river cuts through rock (a typical example is the Grand Canyon). On Mars, fluvial channels are not so common (especially in the past few billion years). But the wind has relentlessly worked away at the surface, sometimes revealing strata laid down long ago.

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