I know how hard it is to answer this question. I know of a few of the things that he can cause. He can cause Tidal Waves, Tsunamis, Earth Quakes (That's why he is know as the Earth Shaker) and destruction of ships on the ocean. Hope this will help you answer that question.
when poseidon would get mad he would cause destruction...kinda like bipolar people
waves
water&waves.
Poseidon is not a mad god in ancient Greek myth, he could become angrey but he was never crazy.
Poseidon was the Greek god of earthquakes, hurricanes, and overall destruction. He treated most Greeks as if they were below them and would constantly cause havoc whenever possible.
he is mad
Poseidon
Athena did cause she was mad at the Gorgon for making out with Poseidon, so she turned her into a monster at her main Temple. Problem solved!
his father, poseidon left him. not by choice, but Percy is still mad at him about it.
Nothing, he wasn't mad at him AT ALL!
He blinded his son, Polyphemus(who was a cyclops)
Poseidon, as the god of the sea, could create havoc and destruction by summoning powerful storms, tsunamis, and earthquakes to unleash his wrath upon humans. He could also manipulate sea creatures to attack ships and coastal settlements, causing chaos and widespread destruction.