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Planetary accretion is the accumulation of particles into a massive object by gravitationally attracting more matter, typically gaseous matter, in an accretion disk.
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While Accretion Disk keep rotating, many large rings are formed. Each ring was combined with numerous small celestial body and started to revolve around the Protosun.
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Crashing with other celestial bodies, the Earth finally formed
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Planetary Cooling is whether the body is a planet or a moon, has to cool off. The warmth contained inside a body controls what sort of surface activity, atmospheric activity, and interior activity which the body has.
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Still not clearly known, but there are many theories about the formation of the Moon. Among these, the most reasonable hypothesis suggests that the Moon formed out of the debris left over from a collision between Earth and an astronomical body
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Heat from the collision between celestial bodies let the Earth melting and eventually formed magma and ocean
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As the collision of the planet bodies decreased, the surface was cooled and a hard crusts were made.
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Near the end of the violence, during a period known as the Late Heavy Bombardment, impacts in the solar system may have increased.
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The Earth inner core was formed about 1~1.5 billion years ago. Relatively variable materials such as silicon and oxygen have formed to form the mantle, while relatively heavy materials such as iron and nickel have moved to the core and formed nuclei.
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The first living things on Earth, single-celled micro-organisms or microbes lacking a cell nucleus or cell membrane known as prokaryotes, seem to have first appeared on Earth almost four billion years ago, just a few hundred million years after the formation of the Earth itself.
