'Sky' in the Bible

Then the Lord said to Moses and Aaron, “Take for yourselves handfuls of soot from a kiln, and let Moses throw it toward the sky in the sight of Pharaoh.

So they took soot from a kiln, and stood before Pharaoh; and Moses threw it toward the sky, and it became boils breaking out with sores on man and beast.

Now the Lord said to Moses, “Stretch out your hand toward the sky, that hail may fall on all the land of Egypt, on man and on beast and on every plant of the field, throughout the land of Egypt.”

Moses stretched out his staff toward the sky, and the Lord sent thunder and hail, and fire ran down to the earth. And the Lord rained hail on the land of Egypt.

Then the Lord said to Moses, “Stretch out your hand toward the sky, that there may be darkness over the land of Egypt, even a darkness which may be felt.”

So Moses stretched out his hand toward the sky, and there was thick darkness in all the land of Egypt for three days.

and they saw the God of Israel; and under His feet there appeared to be a pavement of sapphire, as clear as the sky itself.