The Odyssey Questions Book 10: What sort of character is Circe

Book 10

1. What sort of character is Circe? Why (aside from her magic) is she able to turn Odysseus’ men into swine? What have they done to offend her, or what weakness do they show?
2. What makes Odysseus succumb for a time to Circe’s enticements? What is his mistake here?
3. Why does Odysseus need to visit Hades (the Greek Underworld) and consult with Tiresias the blind prophet of Thebes?