Thank you for clarifying that ancients believed that Gods/goddess had to have caused natural things!
And since you stated that the Greeks and the Romans used many myths to explain these things of nature that they just couldn't understand.
Please explain to us about the phenomenon of nature that is related with the following myth below!
Thank you in advance!

Zeus and Io
Io, the daughter of the river god Inachus, inadvertently attracted the attention of Zeus as she was performing her duties as priestess to the goddess Hera. Every night the god would whisper to her in dreams, inviting her to come and meet him in a meadow close to where her father tended his flocks. Feeling alarmed, Io told her father of these nightly visits. Out of concern for his daughter Inachus promptly sent a messanger to the Oracle at Delphi in hopes of being able to decipher the meaning of these nocturnal escapades. Regrettably for all concerned, the utterings of the Priestess were anything but promising. The herald returned with a somber message; either Inachus must forever exile Io from her homeland or both he and the people of Argos would be destroyed by a thunderbolt.
Knowing that he had no other choice but to heed the words of warning, Inachus sorrowfully drove Io from her home. It came to be that Hera, who was not able to locate her husband anywhere on Mount Olympus noticed that the earth was tightly wrapped in a mysterious thick black mist.
Immediately suspecting that Zeus was behind the odd occurrance, the suspicious goddess sped down from the heavens to investigate. Hearing the sound of her approaching footsteps, Zeus quickly changed Io into a snow white heifer. When Hera parted the hazy cloud, she found her husband sitting alone with only a beautiful white cow for company.
Knowing there must be more to the story than meets the eye, Hera requested that Zeus give her the fine looking animal as a gift. Not wanting to draw anymore attention to himself, Zeus had no other choice but to turn Io over to his wife without an argument. Hera at once ordered Argus Panoptes, a giant with one hundred eyes to stand guard over the unfortunate girl.
She could not have asked for a better watchman than Argus, for never were all of his hundred eyes closed at the same time. Io was tied to an olive tree in the Groves of Mycenae, where she was looked upon both day and night. Zeus sent his messenger Hermes to steal the cow away, but even the god of thieves found it impossible to avoid the vigilant stare of Argus. Because he was an expert in the art of trickery, it was not long before Hermes had devised a plan to save Io.
He took on the appearance of a shepherd and approached Argus playing a homemade pipe of reeds. The giant was so enjoying the sounds of the pleasant music that he invited the god to join him in the grove. Hermes sat down on a rock and continued playing, occasionally stopping to tell long winded tales of satyrs and other woodland deities.
As the god droned on telling story after story, the eyes of the giant became heavy with slumber, closing one by one with every spoken word. When all the eyes were finally shut, Hermes jumped to his feet and killed the sleeping Argus with the blade of his sword. Hera was so distraught over the death of her faithful servant, that she removed his eyes and placed them on the tail of her favorite bird, the peacock. Though it appeared that Io was free, Hera sent a gadfly to chase her rival and torment her with it's constant sting. In her anguish, Io ran from land to land but could find little peace from the winged devil that pursued her.
When she reached the mountains, Io came upon the place where Prometheus was bound. The Titan kindly offered his help by pointing out the best route for her to follow. As her journey continued, Io frantically ran along the shore in search of a safe place to catch her breath. This sea was named The Ionian in her honor.
Io finally came to rest upon the banks of the Nile River in Egypt, and it was there that Zeus restored her to her human form. She bore him a child called Epaphus, who later became one of the kings of Egypt. It was through these descendants of Epaphus that the city of Thebes, Crete and Argos were colonized.
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Lodge, I did not claim that all of the myths describe natural occurences, just that many of them do. I learned this first hand when I was taking classes on Greek/Roman myth. Although from one stand point, the myth of IO and Zeus describes how the peacock got the pattern they do on their feathers. I will list a few examples of myths that describe things of nature. Please keep in mind that I am listing this all from memory because I don't have my mythology book at hand.
1. Hades stole Persephone and tricked her into marrying him. Persephone is the Daughter of Demeter, Goddess of the hearth. Finally a deal was made that Demeter would get to see her daughter for half a year, and Hades the other half. The Half of the year that Demeter didn't get to see her daughter she inflicted her sadness on the earth. Making plants, crops, etc die. But when Demeter got to see her daughter she would restore the earth back to being beautiful again. Thus Describes the change in seasons.
2. The Greek creation myth, which obviously describes how they think the world came into being.
3. In the myth of Echo and Narcissus a sound phenomenon and a flower are both explained. Hera punishes Echo for being to talkative by making it so she can only repeat the last bit of what someone says. Lonely Echo wanders the forests and comes upon Narcissus drinking from a pool of water. Echo falls in love with him. But Narcissus is too busy admiring himself that he falls into the pool and a lovely flower springs up in his place. (The Narcissus flower.) Echo was devastated and wasted away until theres nothing left but her voice. Which can now be heard in caves and on mountains.
4. The myth of Phaethon describes why the sun passes from the east to the west everyday.
Need I say more? Hope this gives you some clarification to why I said that lodge.