What are some of the reasons Annabeth gives for why Poseidon and Athena don and rsquot get along?

Annabeth explains that Poseidon and Athena don't get along because they have conflicting personalities and domains - Poseidon represents the sea and water, while Athena is the goddess of wisdom and warfare. Their rivalry can be traced back to a dispute over the patronage of the city of Athens, with Poseidon offering the city water, and Athena offering the olive tree.