The Genesis account of creation tells how on the second “day” God made an expanse about the earth, and this expanse (called “Heaven”) formed a division between the waters below it (the oceans) and the waters above it:
"And God went on to say: “Let an expanse come to be in between the waters and let a dividing occur between the waters and the waters.” Then God proceeded to make the expanse and to make a division between the waters that should be beneath the expanse and the waters that should be above the expanse. And it came to be so." (Genesis 1:6-8)
This is further explained by the apostle Peter:
"For, according to their wish, this fact escapes their notice, that there were heavens from of old and an earth standing compactly out of water and in the midst of water by the word of God; and by those [means] the world of that time suffered destruction when it was deluged with water. " (2 Peter 3:5,6)
So the Bible explains that there was an insulating blanket for the planet...a water canopy (or, “heavenly ocean”; Heb., mab·bul′; Gen. 6:17) at that time.
Not only does Genesis mention “the floodgates of the heavens” opening up, but it also mentions this in combination with "springs of the watery deep":
"In the six hundredth year of Noah’s life, in the second month, on the seventeenth day of the month, on this day all the springs of the vast watery deep were broken open and the floodgates of the heavens were opened." (Gen. 7:11)
The Bible says that the Deluge was so overwhelming that “all the tall mountains that were under the whole heavens came to be covered.” (Gen. 7:19)
For more, see:
According to the Bible, what was the time span between Adam’s creation to the Flood?
Did the Great Flood of Noah's Day Really Happen?
In what year does the Bible indicate the Great Flood occurred and why didn't Noah's father and grandfather enter the ark?
Who were the "sons of God" mentioned in Genesis 6:2?
Who were the Nephilim?
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