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Terrestrial planets formed when space debris, mostly dust and rocks, constantly bombarding the young planets. This bombardment heated up the planets surface to the point where it began to melt, producing lava. Some of the original heat, though not enough to melt the planets interior, came from gravitational energy released as particles came together to form the terrestrial planets. It is known that all the terrestrial planets were made this way and therefore gave them the similarities in characteristics that they have.
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