| http://www.w3.org/ns/prov#value | - The troughs were discovered at Noctis Labyrintus, also known as ???the labyrinth of the night??? ??? a region that is noted for its system of deep, steep-walled valleys. ???We discovered these locations that show many kinds of minerals that formed by water activity,??? says Catherine Weitz, lead author of a paper featured in the journal Geology and a senior scientist at the Institute. ???The clays
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