Petrichor is the earthy scent produced when rain falls on dry soil. The word is derived from the Greek words “petra” (stone) and “ichor” (the blood of the gods). Petrichor is caused by the release of Volatile Organic Compounds from the soil. These VOCs include geosmin, a compound produced by actinobacteria, and plant oils. When rain hits the ground, it mixes with these VOCs and carries them into the air, where they can be detected by noses. Petrichor is often described as a musky, earthy, or fresh smell. It is often associated with feelings of freshness, cleanliness, and new beginnings.