When the blood dripped from Medusa’s head onto the plains of Libya, each drop of blood transformed into venomous serpents. The power of Medusa’s head is seen again when Perseus encountered the Titan Atlas. When Perseus asked Atlas for a place to rest for a short while, his request was refused. Knowing that he would not be able to defeat the Titan with brute force alone, he took out Medusa’s head, and Atlas was turned into a mountain.
From The Real Story of Medusa: The Protective Powers From a Snake-Haired Gorgon