Short answers, pulled from the story.
Geb was the ancient Egyptian god of the Earth and a member of the Ennead of Heliopolis, the group of nine gods created at the beginning of time. He was the husband of Nut, the sky goddess, and the father of Osiris, Seth, Isis, and Nephthys. Ancient Egyptians believed his laughter created earthquakes and that he allowed crops to grow.
The oldest known representation of Geb is a fragmentary relief found in Heliopolis, dating to the reign of king Djoser during the Third Dynasty. It shows him as an anthropomorphic bearded being accompanied by his name.
Geb was considered the father of snakes because one of the Egyptian words for snake, s3-t3, meant "son of the earth," directly linking serpents to the earth god. In one Coffin Text spell, Geb was named as the father of the mythological snake Nehebkau, a primeval serpent of the underworld.
Geb was equated with Cronus in Greco-Roman Egypt because both occupied parallel roles as earth-father gods who preceded the ruling generation of deities. This equation was especially well documented in Tebtunis in the southern Fayyum, where priests of the local temple of Sobek identified themselves as priests of Geb in Egyptian texts and priests of Cronus in Greek texts.
No. Some Egyptologists proposed the connection based on a mistaken identification between the Whitefronted Goose, whose Egyptian name gb(b) resembled Geb's name, and the actual mythological creator bird, the Nile Goose (Alopochen aegyptiacus) called Gengen-Wer or "Great Honker." The Whitefronted Goose was never a cultic symbol of Geb; the bird-sign appeared only as a phonogram in the spelling of his name.
Geb personified both the fertile earth and the barren desert, which in Egyptian thought held the dead. The phrase "Geb opening his jaws" described the desert releasing the deceased. Those judged unworthy of the afterlife could be imprisoned in the earth by Geb, using his otherworldly attribute, a jackal-headed stave called wsr.t meaning "Mighty One."