'Indeed, nitrate produced by storm lightning all around the world are spread out on the Earth's surface, while volcanic deposits are formed locally in a very short period of time and, according to our results, can contain large amounts of fixed N [nitrogen], a prerequisite for the development of life,' the scientists wrote in the study.
'When you look at the different possibilities, the most likely was volcanic lightning,' the study's lead author Slimane Bekki told NewScientist.
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