Why do you think the Greeks

created the myth of Demeter and

Persephone?

To explain seasons.

Explanation:

If you're talking about the story where Persephone stays with Demeter for half a year, and Hades with the other half, its to explain seasons.

The concept was that when Demeter and Persephone were together, they were happy, warm, and sunny; like spring and summer.

When Hades and Demeter were together, it was cold, chilly, lonely, and dark, like the fall and spring.

Thus explaining the seasons.