View source for Nitrates

Nitrates were identified on Mars in 2015 by the Curiosity rover <ref>https://gizmodo.com/curiosity-has-found-nitrates-important-for-life-on-mars-1693288111</ref>.  They contain Nitrogen, an important elements for life.

Up to 25% of the original atmospheric nitrogen of Mars might be stored on the Martian Cryolite (frozen surface), in molecules such as HNO3.<ref>https://link.springer.com/content/pdf/10.1007/978-3-642-27833-4_5087-2.pdf</ref>

Nitrates could serve as [[fertilizer]], or as a source of [[nitrogen]] for the [[Settlement|settlement atmosphere]].  

Freeing the [[nitrogen]] might be part of an overall Mars [[terraforming]] plan.

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