Those are called "creation myths". They show us how everything, not only earth, was created, and what the gods had to endure in order to do so.
Greeks believed in gods that they always prayed to. All Greeks worship the gods and always had a ritual. They are sacred to them. It was sometimes a law to praise the gods. They had celebrations to worship gods. They believed in monotheism and polytheism sometimes.
B) be + verb + -ing
hope this helps
