How Earth and Us Came About

Primary Accretion Stage

79,800 BCE

The dust is colliding in together and creating little clumps. By the end, the kilometer-sized rock is enough to accrete additional material allowed to grow.

Earth Core Formation

7980 BCE

the inner parts of the solar system has rocky planetesimals becoming planet embryos whereas the outer planets are becoming much bigger. Its colder out there so when the dust and clumps hit each other they attach more easily so things are more efficient and grow bigger.

Giant Impact Stage

798 BCE

Much larger objects are colliding with each other. The planetesimals are really forming and becoming the planets that we know. Four rocky planets in the interior, two gas giants(Jupiter and Saturn), and two ice giants(Uranus and Neptune). At 60 million years, the moon was formed. A object the size of mars crashing into earth, knocks some debris off of it and a very hot molten goop stays in orbit around the earth. Finally, it cools and becomes the moon.

Late Accretion Stage

79 BCE

Pluto like objects crashing into the earth and to the other planets and depositing metal. Metal will normally sink due to its heaviness but in a late accretion stage it can be deposited at the surface. So, the trace elements of different metals that we discover today are because of that stage.

Late Heavy Bombardment

7

Jupiter and Saturn migrated their way towards the inner planets, clearing out a lot more of the rocks and other stuff, and then eventually migrated back out. During that stage, other things might have hit the earth like comets carrying water, explaining the existence of water on earth.

Earth Cools & Feature Form

15

All the heat in the core of the Earth is trying to escape the earth, and the additional radioactive elements are heating it even more. That heat plays two important roles: It allows activity in the core like spinning and the molten metal to remain there, and it is probably the source of the strong magnet.