Enceladus,

the major giants, wanted to take the place of Zeus and so be able to dominate. To do this was to reach the Abode of the Gods. He thought then to build a ladder putting one above the other the world's mountains and turned to his brother for help. Enceladus, was much feared by the giants and nobody wanted to fight it. In fact, when he got angry spitting fire and sparks enough to ignite his own hair, but promptly grew back. So besides it looks terrible also had a bad temper.The young brothers despite themselves took the Mont Blanc, Monte Pindo from neighboring Greece, the great mountains of Asia and stacked on one another. Being the still distant goal. also recovered the high African mountains. They were almost in sight of the goal, when Zeus furious at the arrogance demonstrated, threw on giant lightning making them fall down. The wounded giant and painful writhing on the ground, Zeus still not satisfied with another lightning struck the pile of mountains, which shattered into many pieces covering the bodies of the rebels. Enceladus was buried under several mountains. The head rest buried under Mount Etna. The inability to free themselves from the weight that held him buried, venting his anger erupting flames from his mouth that went up in the top of the mountain coming out with a violent roar. The molten lava from the giant's breath flowed down the slopes of Etna destroying everything he encountered and making the inhabitants flee in panic. So the legend tells the story of the Etna volcano. The giant awakes every now and unleash its power. And so that Etna appears to awaken from his peaceful slumber filling the sky sparks and covering its slopes with new lava flows.

 

According to another version:

According to Hesiod, Typhon was "terrible, outrageous and lawless", and on his shoulders were one hundred snake heads, that emitted fire and every kind of noise: Strength was with his hands in all that he did and the feet of the strong god were untiring. From his shoulders grew a hundred heads of a snake, a fearful dragon, with dark, flickering tongues, and from under the brows of his eyes in his marvellous heads flashed fire, and fire burned from his heads as he glared. And there were voices in all his dreadful heads which uttered every kind of sound unspeakable; for at one time they made sounds such that the gods understood, but at another, the noise of a bull bellowing aloud in proud ungovernable fury; and at another, the sound of a lion, relentless of heart; and at another, sounds like whelps, wonderful to hear; and again, at another, he would hiss, so that the high mountains

From Greek mythology: Typhoon, also called Typhon or Typhon, whose name means "astonishing smoke."

Gea, disappointed for the defeat of his children, the Titans and the Giants, for Zeus's work, complained about him at the wife of the king of the gods: Hera. The queen of the gods believed the words of the goddess and, determined to take revenge against his wife, turned to Kronos, Zeus had previously ousted, and begged him to help her. Determined to avenge his son-rival, the king of the Titans, and the time you masturbated on two eggs, which he entrusted to the goddess, adding to bury them so that, at the preset time, were open to give birth to a demon that can oust the same Zeus. Had listened to his suggestions and, after a certain period, from those eggs she was born monster Typhon. Once grown, Typhoon went up to Mount Olympus and incusse such a fear that these gods were transformed into animals and fled to Egypt (where it would provide the local cult of animal gods).

So are transformed to the gods:

• Zeus became aries,
• Aphrodite fish,
• Apollo Crow,
• Dionysus goat,
• Hera a white cow,
• Artemis a cat,
• Ares a boar,
• Ermes an ibis,
• Ade a jackal,
• Pan turned only his bottom in a fish and hid in a river.

Zeus was harshly reproached by his daughter Athena, who reminded him how he depended on the fate of mankind. The two deities so also assumed gigantic proportions and they faced the monster on Mount Casio, the border of Egypt. In the first, harsh Athena clash was knocked out in a few moments, but then Zeus managed to repel Typhoon with a powerful lightning bolt and then to shoot it down with blows of the scythe. But when the king of the gods came to throw the decisive blow, Typhoon snatched the gun from his hands and wounded him severely, then imprisoning him in a cave of Cilicia.

Hermes and Pan then rushed to rescue Zeus. Pan startled the monster with his screams, while Hermes Zeus freed from prison and cured him. The god reaches the Olympus, he took the leadership of its winged chariot and began to chase the giant, surprised by his reaction. A first violent battle took place on Mount Nysa, and a second in Thrace, where Typhoon, now out of control, tried to stop Zeus throwing him whole mountains, but each time the god smote him with implacable thunderbolts. At the end Typhon he fled westward and reached Sicily tried a desperate defense by lifting the entire island to to throw it against the King of Olympus. At this point, Zeus jet towards the giant one last, powerful lightning bolt that struck him full. Typhoon missed his grip and remained crushed under the island that collapsed on him. The head rest buried under Mount Etna and his anger transformed the mountain into the volcano.

 wikipedia 

legend of Polyphemus