Mars: More water and more questions

NASA announced the week that Curiosity has backtracked to a formation it passed a few months ago to take a closer look at deposits of silica.C00002

Silica is silicon dioxide, a mineral which makes up 26% of the earth’s crust by weight. Silica based minerals include quartz, opal and tridymite. Tridymite is rare on earth and is usually found in areas which have experienced magma flow. NASA scientists were surprised to find it in the silica deposits examined by Curiosity.

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