Petrichor
Petrichor is the distinctive earthy smell produced when rain falls on dry ground. It arises as raindrops release compounds including plant oils and geosmin from soil microorganisms into the air.
The earthy smell after rain has a name: Petrichor. Its core is Geosmin, a molecule from soil Microorganisms that the human nose catches at just 5 parts per trillion—said to beat a shark smelling blood in water. Perhaps a trace of ancestors who sniffed out water on dry land.
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