The Second Day of Creation: The Dividing of The Waters

Genesis 1:6-8

6  And God said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters. 
7  And God made the firmament, and divided the waters which were under the firmament from the waters which were above the firmament: and it was so. 
8  And God called the firmament Heaven. And the evening and the morning were the second day.