Which three sentences in the story indicate that that the passage is an ex nihilo type of creation story?

There was as yet no man, nor any animal, nor bird, nor fish, nor crawfish, nor any pit, nor ravine, nor green herb, nor any tree; nothing was but the firmament.

Lo, now how the heavens exist, how exists also the Heart of Heaven; such is the name of God; it is thus that he is called.

And the creation was verily after this wise: Earth, they said, and on the instant it was formed; like a cloud or a fog was its beginning.