There was important news this week regarding the geology theory, "The Story Of Planet Earth", on the geology blog.
The following two paragraphs are the brief abstract that I use to introduce the theory.
Basically, the theory which reveals the explanation for so much of the major features of the earth's topography and the seafloor ridges is that the continents on earth came from three Continental Asteroids. Much debris from the Continental Asteroids was hurtled back into space, where it coalesced by gravity to form the moon. The idea of the moon forming in this way is not new, the asteroid is commonly referred to as "Theia", but my theory expands on it to include the continents as well. Each of the impacts of the Continental Asteroids unbalanced the earth's rotation, by the addition of the new mass, so that the earth's poles and equator underwent three shifts to regain rotational balance by centering one of the poles in the new additional landmass. The land mass from each Continental Asteroid was eventually broken up by tectonic activity, driven by the centrifugal force of the earth's rotation. The south pole is today in Antarctica because that was the core of a Continental Asteroid. A similar situation is seen on Mars, where the southern hemisphere is higher in elevation and thus heavier, than the northern hemisphere. But this does not upset the rotation of Mars because the south pole is in the center of the heavier hemisphere. What this means is that there have been four polar eras on earth, with the poles and equator in different places in each era. We are in the fourth polar era, after the Third Continental Asteroid. The First Polar Era was before the First Continental Asteroid.
The spin of the earth causes magma, hot molten rock, to emerge from below along the equator by centrifugal force. According to the laws of fluid dynamics, this equatorial emergence must then be balanced by periodic longitudinal lines of emergence in a perpendicular direction to the equator. Each time the poles and equator shifts, to regain rotational balance after the added mass of a Continental Asteroid, these lines of magma emergence must also shift, but magma emergence continues along old longitudinal and equatorial lines for a long time. This scenario explains just so much about the topography of the land and seafloor, and leaves few major features of the earth unexplained.
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