But why did God destroy the first heaven and earth age?
That answer is simple.
Because of the rebellion of one whose name was Lucifer, he's called Satan now,
who we learn in Revelation 12 drew one third of the sons of God away from Him and into his own camp.
Ezekiel tells us what happened to this one?
Ezekiel 28:12-19 Son of man, take up a lamentation upon the king of Tyrus, and say unto him, Thus saith the Lord GOD; Thou sealest up the sum, full of wisdom, and perfect in beauty.
 Thou hast been in Eden the garden of God; every precious stone was thy covering, the sardius, topaz, and the diamond, the beryl, the onyx, and the jasper, the sapphire, the emerald, and the carbuncle, and gold: the workmanship of thy tabrets and of thy pipes was prepared in thee in the day that thou wast created.  Thou art the anointed cherub that covereth; and I have set thee so: thou wast upon the holy mountain of God; thou hast walked up and down in the midst of the stones of fire.
But he wanted to sit on the throne and be the one in charge, i.e. be like God.
 Thou wast perfect in thy ways from the day that thou wast created, till iniquity was found in thee.
He was a free-will son of God, created by Him, perfect and beautiful.
(Note: Satan does not run around in a little red suit toting a pitch fork.)
Continuing with Satan's fall:
 By the multitude of thy merchandise they have filled the midst of thee with violence, and thou hast sinned: therefore I will cast thee as profane out of the mountain of God: and I will destroy thee, O covering cherub, from the midst of the stones of fire.
 Thine heart was lifted up because of thy beauty, thou hast corrupted thy wisdom by reason of thy brightness: I will cast thee to the ground, I will lay thee before kings, that they may behold thee.
 Thou hast defiled thy sanctuaries by the multitude of thine iniquities, by the iniquity of thy traffick; therefore will I bring forth a fire from the midst of thee, it shall devour thee, and I will bring thee to ashes upon the earth in the sight of all them that behold thee.
That is why he is called the son of perdition, the son who will perish.
Note: Actually it's the first and only death for him because he will never live in a flesh and blood body like we now find ourselves in; so for him to perish is the first and final death (the loss of his soul, TO BE NO MORE! (He is not offered the opportunity to live in the flesh so the shadow death talked about in the 23rd Psalm, which we all die, without losing our souls, is not available to Lucifer/Satan)
 All they that know thee among the people shall be astonished at thee: thou shalt be a terror, and never shalt thou be any more.
It's gone, forever and ever!
But judgment for the rest of God's children has been postponed
until after the millennium,
at the great white throne judgment, until God's plan of salvation,
of restoring His sons (whosoever will) to Him, is complete.
So, our Father chose not to judge His other children at
the time of Satan's rebellion
but chose rather to destroy the "earth age that then was"
and create a new heaven and a new earth, which are now, just as Peter explained.
The Creator shook this old planet (or perhaps smote it with a meteor) and knocked it off of its true axis and out of its true orbit.
That is why there's a magnetic declination where magnetic north and true north are as much as 80 km apart.
And since the earth now "wobbles" it produces the "jet stream" which determines patterns of weather and storms.
In the "world that then was" the entire earth was as a tropical garden. That is evidenced by the recent discovery of Mastodons in the artic regions, frozen solid in their tracks, with buttercups still in their mouths.
That global destruction, that "tohu va bohu" of Gen. 1:2,
wiped out all living things,
and destroyed to utter ruin all the cities and habitable places of that earth age. It is the age to which all "Fossils" and "Remains" belong.
The geological evidence of a worldwide catastrophe are everywhere, and then some.
Listen to our Father describe the destruction Himself.
Jeremiah 4:22-27 For my people is foolish, they have not known me; they are sottish children, and they have none understanding: they are wise to do evil, but to do good they have no knowledge.
Look up the word "sottish", it means "stupid".
Hey, He tells it like it is!
 I beheld the earth, and, lo, it was without form, and void; and the heavens, and they had no light.
And even the heavens had no light, which is why he later commanded "let there be light".
There was light in the days of Noah, but not at this destruction.
The earth was violently shaken. I beheld the mountains, and, lo, they trembled, and all the hills moved lightly.
 I beheld, and, lo, there was no man, and all the birds of the heavens were fled.
This says there was NO MAN and NO BIRDS.
 I beheld, and, lo, the fruitful place was a wilderness, and all the cities thereof were broken down at the presence of the LORD, and by his fierce anger.
There were cities in the world that then was, and they certainly became "lost".
And you and I and all of God's children were there in that "world that then was".
were still in our celestial bodies in that 1st earth age, so scientists
can find no bones, because we had none while in those bodies.
Do you remember the mysteries that Paul taught,
how in Ephesians 1:4 he tells us that God's elect were chosen before the "katabole",
the overthrow of Satan, before the foundation of this earth age?
(Stay with us and we'll document it.)
so we began in Gen. 1:1 with the creation, in the beginning, of a beautiful,
inhabitable earth, and we end verse 2 with a dark and desolated world,
destroyed by His fierce anger to a state of tohu va bohu.
In previous lessons we spent a great
deal of time documenting
and establishing the fact that the beautiful heaven and earth age "that then was",
that which was created in the beginning (Gen 1:1), perished (Gen 1:2).
Our Father destroyed it when He
overthrew Satan at his rebellion
and reduced it to the state of "tohu va bohu", utterly void and desolate.
The physical (Scientific) evidence
of this destruction is overwhelming,
the spiritual (Biblical) evidence is conclusive.
There is no conflict between true science and God's Word.
There never was and there never will be!
This foundational knowledge is essential to the true understanding of the entirety of God's Word.
It is one of the main reasons that
many who claim to be instructors and teachers of the Bible
struggle to explain what should be simple verses and simple passages.
For if you don't understand what
happened in the beginning,
if you start out with a "mental declination" and are off track just 80 km before you begin,
by the time you should have reached your destination of understanding,
you will have passed by the major benchmarks of truth
and be totally "lost" in the land of confusion, which is the state of Babylon.
To study the 1st. 11 chapters of Genesis word for word: (live link to) All 11 chapters in one complete study
To study the Bible is the noblest of all pursuits;
to understand it, the highest of all goals.
We pray that with the guidance of the Holy Spirit, you accomplish both.