Editing Ammonia (section)

== Natural occurrence (abiological)==
Traces of ammonia/ammonium are found in rainwater. [[Ammonium chloride]] ([[sal ammoniac]]), and [[ammonium sulfate]] are found in volcanic districts. Crystals of [[ammonium bicarbonate]] have been found in [[Patagonia]] [[guano]].{{sfn|Chisholm|1911|p=861}}

Ammonia is found throughout the [[Solar System]] on [[Mars]], [[Jupiter]], [[Saturn]], [[Uranus]], [[Neptune]], and [[Pluto]], among other places: on smaller, icy [[Minor planet|bodies]] such as Pluto, ammonia can act as a geologically important antifreeze, as a mixture of water and ammonia can have a melting point as low as {{convert|−100|C|F K}} if the ammonia concentration is high enough and thus allow such bodies to retain internal oceans and active geology at a far lower temperature than would be possible with water alone.<ref>Shannon, Francis Patrick (1938) [http://digital.lib.lehigh.edu/eb/supp/3646/index.pdf Tables of the properties of aqua–ammonia solutions. Part 1 of The Thermodynamics of Absorption Refrigeration]. Lehigh University studies. Science and technology series</ref><ref>[http://www.purdue.edu/newsroom/releases/2015/Q4/an-ammonia-water-slurry-may-swirl-below-plutos-icy-surface.html An ammonia–water slurry may swirl below Pluto's icy surface]. Purdue University (9 November 2015)</ref> Substances containing ammonia, or those that are similar to it, are called ''ammoniacal''.<ref>{{Cite web |date=July 2023 |title=ammoniacal (adj.) |url=https://www.oed.com/dictionary/ammoniacal_adj |website=Oxford English Dictionary |doi=10.1093/OED/3565252514}}</ref>