On Day 3 God introduces us to flow or motion for the first time. This has the very significant effect of enabling the materials that were in suspension in the water from the beginning to separate out and so the dry land appears.
I’m loving this. The elegance, comprehensiveness and beauty of the creation account is staggering:
In the beginning God creates all the materials (elements) that He wants to work with. They exist in an amorphous watery mess suspended on nothing in darkness. The Spirit is pregnant with ideas and the Word then is spoken.
On Day 1 the framework of time and space is spoken into being and light is the measuring tool that constrains and simultaneously illuminates everything.
On Day 2 space is created and so now objects can be made. The first distinguishable objects are the heavens and the earth.
On the first part of Day 3 God introduces the idea of motion. The earth (and everything else) spins and (just like in a centrifuge) dry land appears.
Now God has the base on which He can start making beautiful things.