Stanza 4 of the poem Völuspá contains an alternative Old Norse creation story. Then Borr's sons lifted | the level land, Miðgarðr the mighty | there they made; The sun from the south | warmed the stones of earth, And green was the ground | with growing leeks. The sons are of course Óðinn, Vili and Vé, the raven deities therefore, according to Snorri, three ornithomorph gods are associated with creation by raising the earth. To be honest all of this reminds me of Eurasian earth diver cosmogonies featuring diving birds, though Snorri doesn't go into detail about how the earth was actually raised. It would be nice had Snorri provided more details, but then again, maybe he didn't have any to hand down.