Thematic Bible: Second day, making the firmament or atmosphere, and separating the waters

And God said, Let there be a firmament [the expanse of the sky] in the midst of the waters, and let it separate the waters [below] from the waters [above]. And God made the firmament [the expanse] and separated the waters which were under the expanse from the waters which were above the expanse. And it was so. And God called the firmament Heavens. And there was evening and there was morning, a second day.