What ever dramatic events took place to account for our Earth's mass remain hidden, in the mists of time. We could speculate endlessly about how the Earth came into existence: Did it slowly accreted from dust orbiting the Sun? Or did some swiftly moving interloper from Outer Space perhaps splash Our Planet, along with the Icy Europa, from the bowels of Jupiter? Or could Earth just be a lonely passer-by, which veered a little to close and became snared in our Sun's gravity.
The possibilities that could account for our Earth's mass are endless, but any discussion of them would be just idle speculation. For there is not one iota of evidence concerning the Earth's origin, to hang a theory on.
Since we don't know how the Earth originated, our story must begin with the Earth already in place. We could dwell upon whether or not the Earth’s crust was ever hot enough to convert all of its waters into steam. But lacking a shred of evidence concerning that subject, it too would be just so much more idle speculation. So let’s skip it.
The oldest rocks ever found [rocks scientists claim are between three and four billion years old] have all been exposed to sufficient heat to badly deform, and metamorphose them, rendering them useless as evidence about the environmental conditions during those long ago eras. Their condition does indicate that the Earth once had a much thinner, warmer, crust than it now has and their residual magnetism does collectively point toward the past locations of the North Magnetic Pole.
Actually although it is seldom acknowledged, the Earth by all indications had a thin enough crust four billion years ago for gravity to have formed it into a near-perfect sphere. A sphere almost evenly covered with about 9,000 feet, 3,000 meters, of water. Few scientists have ever dared to even stick a toe into this subject: Because the hypothesis is in accord with the biblical, "Genesis'," account of Creation.
Such an Earth does not appear to have been the most ideal place for life to originate. Neither does it leave open any possibility that "In-the-beginning" there was some great super continent, a Pangaea. The truth is; at that point in time, the crust of the Earth wasn't strong enough to support a continent. And of course accepting this hypothesis leaves us with an age-old enigma to explain: "Just how did all of Earth's land, continent sized chunks of the ocean floor, get levitated above sea-level?"
There is sufficient evidence now available to unravel the Earth's real history. First we must set aside our own predispositions, objectively weigh the meager magnetic evidence available in the Earth's primeval rocks to ascertain the original site of the North Magnetic Pole. And then geometrically chart and interpret the lay of Earth's lands: And almost magically the chapters of early Earth History will begin to unfold.
"In-The-Beginning" the Earth was round and featureless, a near-perfect sphere blanketed within an “Endless Ocean.” Originally there were no continents, not even a jagged mountain range rose above the sea to bask in the Sun, or in eternal darkness. The Endless Ocean was the Earth's only feature for well over two billion years. Oh, its likely some volcanic islands emerged from the depths over such an eon, but millions upon millions of years surely eroded all but the youngest of them from view.
The "Bible" states that originally: "Darkness lay upon the face of the deep." And In-The-Beginning total darkness did cover half of the Earth. [And all the Earth's Crust, land, was buried deep within the cold, dark, depths of the primeval ocean.] For the first nine-tenths of Earth History the Earth only rotated but once a year, and was so synchronized with the Earth's orbit that the sunny-side continuously faced the Sun, while the other side lingered in eternal darkness.