NASA again discover more proofs about MARS watery past, Spirit Rover was making some tracks on the soild cuz one of his wheels doesnt function so it moves a lot of soil from there and NASA people decide to take a look and the took the last picture that shows SILICA in the presence of water, the material is 90% Silica.
LINKS
NASA Rover Finds Surprising Evidence for Mars' Watery Past - Yahoo! News
MARS Rovers Special Report
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