The Meridiani Planum region on Mars is rich in minerals derived from evaporation, but lacks a topography consistent with standing water. Do the deposits stem from upwelling groundwater early in the planet's history?
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Baker, V. Water cycling on Mars. Nature 446, 150–151 (2007). https://doi.org/10.1038/446150b
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DOI: https://doi.org/10.1038/446150b
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