Question

In the second day of creation, God created an arch in the midst of the waters and let it divide the waters from the waters. What was that arch?

Answer 1

The firmament is described in Genesis 1:6–8 in the Genesis creation narrative: Then God said, “Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.” ... And God called the firmament Heaven. So the evening and the morning were the second day.