'Separation' in the Bible

And God saw the light, that [it was] good, and God caused [there to be] a separation between the light and between the darkness.

And God said, "Let there be a vaulted dome in the midst of the waters, and {let it cause a separation between the waters}."

So God made the vaulted dome, and he caused a separation between the waters which [were] under the vaulted dome and between the waters which were over the vaulted dome. And it was so.