Soil’s earthy smell comes from chemicals produced by bacteria called Streptomyces, which use the odour to attract springtails to help disperse their spores
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https://www.newscientist.com/article/2239854-soil-gets-its-smell-from-bacteria-trying-to-attract-invertebrates/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home
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