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The solar system was a cloud of dust and gas known as a solar nebula. Gravity collapsed the material in on itself as it began to spin, forming the sun in the center of the nebula.
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It formed the planet into a molten ("melting") planet. Different elements in space helped formed the planet into a sphere. There were volcanic eruptions as well which contained magma. The magma then hardened which created Earth's outer core.
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Gravitation pulled denser and heavy materials like iron towards the core, while the top was covered with not-so-dense materials like dust.
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The moon was formed from remains of a collision between the newborn Earth and a Mars-size rock, with meteorites coating afterward.
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This period is also known as the lunar cataclysm, because the first evidence of the LHB was found on the Moon. During this period, the continents of oceans on earth are stabilized by the decrease of unstable movements of astroids.
