Task: Question Generation
Input (English): The superior god of Oeselians as described by Henry of Latvia was called Tharapita. According to the legend in the chronicle Tharapita was born on a forested mountain in Virumaa (Latin: Vironia), mainland Estonia from where he flew to Oesel, Saaremaa The name Taarapita has been interpreted as "Taara, help!"/"Thor, help!" (Taara a(v)ita in Estonian) or "Taara keeper"/"Thor keeper" (Taara pidaja) Taara is associated with the Scandinavian god Thor. The story of Tharapita's or Taara's flight from Vironia to Saaremaa has been associated with a major meteor disaster estimated to have happened in 660 ± 85 BC that formed Kaali crater in Saaremaa.
Output (English): What event formed a crater in Saaremaa?