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Early Earth was heated through gravitational contraction as the planet formed, where the immense gravitational forces caused materials to compress, generating heat. Additionally, radioactive decay of isotopes such as uranium and thorium released energy, contributing to the planet's thermal state. Furthermore, the bombardment of asteroids and meteorites during the Late Heavy Bombardment delivered kinetic energy, further raising temperatures and causing melting of the surface. These processes collectively contributed to the intense heat that characterized the primordial Earth.

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What is meteorite bombardment?

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