Gen 1:6-8
6 God spoke: "Sky! In the middle of the waters; separate water from water!" 7 God made sky.
He separated the water under sky from the water above sky. And there it was: 8 he named sky the Heavens; It was evening, it was morning — Day Two.

Have you ever heard someone talk about this? People love going to the ocean but no one is ever amazed that there is one!