THE HEBREW WORD FOR EARTH IS ERETZ. In many scriptures the word Eretz is speaking only about a little piece of land. Such as “Eretz” of Israel or Land of Israel.
In scripture the flood is being spoken of as covering all the Land/Earth/Eretz which surrounded the Adam race, which is one valley about 350 by 650 miles in size.
Description of the Event in the Bible
Gen. 7:19 “and all of the high hills that were under the whole heaven were covered.” (see bottom of this page)
Genesis 5:1 says “this is the book of the Genealogy of Adam”, not the book of the other two-legged upright walking creatures the bible shows. Long before Adam, the heavens and earth were completed Gen. 1:2, then it “became” desolate and darkness covered it is the accurate literal translation (see Greek and Hebrew dictionaries to verify). Ezekiel 31 says
The Assyrian Race is called “a Tree in the Garden of Eden” and the other trees were Envious. The trees are Races as we read in Leviticus 26:4, 20; Deuteronomy 28:40, 42; Judges 9:8-15; 1 Kings 4:33; 2 King 3:25; 1 Chronicles 16:33; Psalm 96:2; Isaiah 7:2; 10:18; 14:8; 55:12; 61:3; Ezekiel 17:24; 31; Hosea 2:12; Joel 1:12; Zechariah 1:8; 4:4-12; Matthew 3:10; 8:24; Luke 3:9; 21:29; Jude 11:12; Revelation 7:3; 11:4. Satan Ruled over these nations “before” he fell from heaven as it reads in Isaiah 14:12: “How art thou fallen from heaven, O Lucifer, son of the morning! how art(present tense) thou cut down to the ground, which didst(past tense) weaken the nations!”