Now, after the core has formed and starts to cool, some of the dissolved elements begin to come out of solution. First to come out are calcium, magnesium, and uranium by combining with sulfur. The calcium and magnesium sulfides float to the top of the core, the uranium sulfide sinks to the center of the Earth where it eventually forms the georeactor, which starts as just a big mass of uranium. The georeactor produces the Earth's magnetic field and as well as provides a source of heat to power hot-spots, such as underlie Hawaii. As the core cools, silicon combines with nickel, and sinks to form the inner core atop the georeactor.
Meanwhile, it's still raining. Now, the rock-forming elements rain down forming the rest of the Earth. Finally, the ices and gases are attracted by gravity and form a planet about the size of Jupiter. Then, as the Sun starts to burn, it goes through a brief unstable period, called the T-Tauri phase, with super-intense solar winds, that strip away Earth's massive gas envelope, leaving behind the rocky Earth that has been compressed to about 64% of its present diameter by the weight of 300 Earth-masses of gas and ice. Inside Earth, great pressures build, and at some point, the solid rock crust begins to crack and Earth begins to decompress, driven by the stored energy of compression remaining from its gas-giant stage. At the surface two kinds of cracks form, one kind has sources of heat that can cause lava to erupt, the other doesn't, but those cracks provide a place for the lava to fill in.
For more details, references, and links to download scientific papers, please check out the following webpages:
J. Marvin Herndon's Early Earth Formation as a Jupiter-like Gas Giant Click_Here
J. Marvin Herndon's Whole-Earth Decompression Dynamics Click_Here
J. Marvin Herndon's Nuclear Georeactor Click_Here
J. Marvin Herndon's Discovery of the Composition of Earth's Interior Parts Click_Here
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