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Oh dear! not againhttp://www.thenakedscientists.com/forum/index.php?topic=17097.0
That being the decay of uranium into more massive elements in the core. IE decay elements being "fluffier" and taking up more space. These newer elements putting pressure on the crust and growing the planet.
I looked for intormation on this at another site and someone has a theory that all of Mars' water is now on Earth.