Genesis 1:6-8 - Sky

⁶ And God said, “Let there be a vault between the waters to separate water from water.” ⁷ So God made the vault and separated the water under the vault from the water above it. And it was so. ⁸ God called the vault “sky.” And there was evening, and there was morning—the second day.

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'And God said' - Again we see that God speaks. God is intellegent, all wise, all knowing. He deserves all honour, glory and praise for all eternity. Without God nothing would have changed in the earth, it was by His word that things changes, everything happens in his timing and according to his will, his plan. He is all powerful, He can do anything. Trust him!
'Let there be a vault...' - The word here which says Vault can also be translated as expanse or separation. This (I think) is the creation of the atmosphere, which is needed to sustain life here on earth. God created everything in order: Without the atmosphere, or light, the plants (which were created on day 3) could not have survived. Without the plants to make oxygen, the Birds and fish (from day 5) wouldn't have survived either, nor would have the other animals (Day 6). God knows our needs, and he will meet them according to his will, and in his timing. We must trust him. This also probably refers to the water cycle, the water on earth is separated from the clouds. Some say (and I agree with this) that before the fall there was no rain: The earth was covered in clouds, which created a perfect atmosphere, so it let enough heat in and created a perfect ecosystem for everything - there wouldn't be any sunburn or any problems caused by the sun. But we also learn that while it didn't rain, there was water from the ground which watered everything. (Genesis 2:5-6)
'And it was so' - God does his will, what he plans comes to pass, he is all powerful and reigns eternally. Put your trust in him!
'Evening and Morning' - Again, there is evening and morning, as happens every 24 hour day. Some would argue that this just refers to the end of a long period and the beginning of the next one. This is called old earth creationism, and I have yet to come across any biblical reasoning behind it. (Feel free to comment below if you have some)


Jeremiah 10:12 But God made the earth by his power; he founded the world by his wisdom and stretched out the heavens by his understanding.