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Here on Earth, we find silica deposition in glaciers which are characteristic of melting water, on Mars, we can identify similar silica deposits in younger areas, but we can also see older areas which are similar to deep soils from warm climates on Earth. This leads us to believe that on Mars 3 to 4 billion years ago, we had a general slow trend from warm to cold, with periods of thawing and freezing. If this is so, it is important in the search for possible life on Mars.

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