I see discussion about Rev. 20:14 in here but has anyone in this debate even read Rev. 20:13? Context is important.
And
the sea gave up the dead which were in it, and
death and Hades gave up the dead which were in them; and they were judged, every one
of them according to their deeds.
If 'the sea' is literal, death and Hades (it is to be treated as one word if 'the sea' is literal) must be referring to the grave. Hence, Rev. 20:14 actually says "Then the grave was thrown into the lake of fire. This is the second death, the lake of fire."
Rev. 21:1 Then I saw a new heaven and a new earth; for the first heaven and the first earth passed away, and
there is no longer any sea.
But where is the grave located?
Matt. 12:40 for just as JONAH WAS THREE DAYS AND THREE NIGHTS IN THE BELLY OF THE SEA MONSTER, so will the Son of Man be three days and three nights in
the heart of the earth.
Numbers 16:29-33
Rev. 9:2-3 He opened the bottomless pit [Lit 'shaft of the abyss'], and smoke went up out of the pit,
like the smoke of a great furnace; and the
sun and the air were darkened by the smoke of the pit. 3 Then out of the smoke came locusts upon [Lit 'into'] the earth, and power was given them, as the scorpions of the earth have power.
So the earth's surface will collapse and will fall into it's core.
But that is not how the world will end. This is:
2 peter 3:10; 1 chronicles 16:30; psalm 104:5; job 18:4; job 34:14-15 NASB; - A New Heaven and Earth But the day of - Bible Gateway
Hence,
also why there will be no sea.