Final answer:
Crater Lake was created after the eruption and collapse of Mt. Mazama around 7,700 years ago, an event that also features in the Klamath people's oral history.
Step-by-step explanation:
Crater Lake formed 7,700 years ago after eruption and collapse of Mt. Mazama. Geologists have established that Crater Lake in Oregon is situated where a large volcano, Mount Mazama or Moy Yaina, once stood. The volcano's eruption led to the collapse of the mountain's top into the cone, thereby forming a caldera that eventually filled with water to become Crater Lake.
This geological phenomenon aligns with the oral traditions of the Indigenous Klamath people, who tell the story of Moy Yaina's explosive battle with Mlaiksi, another mountain which is known as Mount Shasta located in California.