Final answer:
The relief Vishnu churning of sea of milk at Angkor Wat depicts the Hindu myth of the churning of the Milky Ocean. In this myth, Vishnu takes the form of a turtle to support the mountain used as a churning stick, while the demons and gods churn the ocean to extract the elixir of immortality.
Step-by-step explanation:
The relief Vishnu churning of sea of milk at Angkor Wat depicts the Hindu myth of the churning of the Milky Ocean. In this myth, Vishnu takes the form of a turtle to support the mountain used as a churning stick, while the demons and gods churn the ocean to extract the elixir of immortality. This relief is a representation of this significant event in Hindu mythology.