He took the head of Medusa out of his bad. Anyone you looks at Medusa's face gets turned to stone.
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
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
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.
Turn anyone to stone
he put atlas under a spell where atlas had to hold up the sky for eternity
I cannot remember this. Are you perhaps thinking of Atlas, who was turned to stone by Perseus who showed him Medusas head? Atlas was a Titan, a relative of Zeus but not his son.