Magma may have provided the water that etched gullies on Mars' surface.
References
McSween,H. Y. et al. Geochemical evidence for magmatic water within Mars from pyroxenes in the Shergotty meteorite. Nature 409,487- 490 2001.
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Ball, P. Rising damp on the red planet. Nature (2001). https://doi.org/10.1038/news010125-11
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DOI: https://doi.org/10.1038/news010125-11
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