Perseus used her severed head to turn Atlas to stone. Later he rescued princess Andromeda from being eaten by a sea monster, which Perseus also turned to stone.
Perseus
He didn't - it was Athena who out of pity turned Atlas to stone with Medusa's head to relieve him of holding up the Ouranos or sky from the Earth; he then became the Atlas mountains
One of Zeus' sons, Perseus, was not turned to stone. However, the Gorgon Medusa, whom Perseus defeated, could turn people to stone with her gaze. Perseus used the reflection in his shield to avoid looking directly at her and managed to defeat her.
Atlas-Perseus turned Atlas to stone so he could no longer feel his burden Andromeda-she was being sacraificed to Poseidon's sea monster when Perseus saved her.
Atlas
Perseus did this. He was flying by with his winged sandals and he saw Atlas holding up the sky. He felt sorry for Atlas and turned him into stone with Medusa's head. This is supposedly how Mount Atlas came about.
Perseus.
Perseus turned the sea monster, Cetus, into stone when he showed him the head of Medusa as he was flying over Ethiopia on his way back home.
Perseus, son of Zeus, killed the snake-haired Medusa by cutting off her head with a sword given to him by the gods. After killing Medusa, Perseus used her head as a weapon, turning Atlas to stone when he tried to attack him.
Turn anyone to stone
he put atlas under a spell where atlas had to hold up the sky for eternity