Geology is a pretty interesting subject for just about anyone that picks up a rock and wonders about it's history. There is an interesting idea in some small science circles that suggests that the Earth might by getting bigger as it get's older. On a glance, it sounds like a pretty crazy idea, but it's one that is growing in popularity as people really look at it. It's also one that glares hard core into every branch of science there is.
We have all learned about Pangea and the evolution of the planet in school. In short, we had a solar system of dust, that turned into planets. When the earth first cooled enough for water, it was a massive ocean. Over time, much like the haywain islands, land formed and was pushed above the water. Over millions of years that land came together to form a super continent Pangea. That super continent broke up and has drifted apart into todays configuration. This theory is called Plate Tectonics and is the accepted explanation for how the earth has developed for the past four point something billion years.
Expansion Tectonics, best presented by a Professor James Maxlow suggests this is wrong. That five hundred million years ago the earth had finished forming, but it was more like the size of mars than the earth we know it today. The super content of Pangea wasn't just a massive island in a more massive ocean, it was the crust of the entire planet earth. Over time, the earth got more massive from within, pushing, stretching the surface, breaking up that massive continent into today's configuration.
It's an interesting idea, and it brings up some interesting points. For example, the dinosaurs who ruled the earth for millions of years had some pretty impressive mass to them. Scientists today are sometimes left a little confused about how some of them even managed to keep their heads up. But if the earth had been more like the mass of mars back then, mass on larger creatures might have been a little different.