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

And God said, Let there be an expanse in the midst of the waters, and let it be a means of dividing, between waters and waters, And God made the expanse, and it divided between the waters that were under the expanse and the waters that were above the expanse. And it was so. And God called the expanse, heavens. So it was evening - and it was morning, a, second day.