Off of the top of my head:
Some Egyptian myths explain:
Some Roman/Greek myths eaxplain(they are practically the same, they just have different names):
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There are many, many naturaloccurrences that the many, many Zeus myths try to explain, but the simple myth that Zeus exists and has otherworldly powers explains lightning, rain, and weather patterns.
It would help to say what myth you want to know about. There are thousands of myths in the world, and no one can read minds about which myth you mean.
Yes, usually they do because the Greeks had no other explenation for it so they would create myths and stories for it.
A myth is a traditional story concerning the early history of a people or explaining some natural or social phenomenon, and typically involving supernatural beings or events. Eg, the heroes of Greek myth.
Some are and some are not.
Existential questions.
To explain the seasons.
The Greeks used myths to explain events that they did not understand.