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Post by Marsrocks on Jan 25, 2011 13:00:17 GMT -5
en.wikipedia.org/wiki/Case_hardening_of_rocksThe Mars scientific exploring machine Spirit has observed case hardening present of the rock surface present at Gusev meteorite Crater. This phenomenon is attributed to the weathering by means of surface water, being considered to be an evidence of liquid water in a far past on that planet [4].
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