How did mount Olympus form?

Answer 1

They never really say. Some accounts allude to it forming in the aftermath of the Titanomachy, but others indicate that Olympus and Othrys were the "bases" for the gods and Titans respectively, which means it already existed.

Answer 2

Mount Olympus was made by Zeus being hungry and not having a bathroom. Zeus got so mad one day, his roars formed peaks to rise. From that day on, mount Olympus was the home for greek gods containing foods and Plumbing.

Answer 3

Mount as in Mountain - Olympus as in Olympians. Mount Olympus is the name of the highest mountain in Greece. The top touches the sky, and that's where the Greek gods supposedly lived.