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4 BCE
End of Heavy Bombardment
There were disrupted comets were sent in all directions and collided with the planets. These water-rich objects may have provided much of the water in the Earth's oceans. Later, Earth was able to cool down and continents on which we live on were formed on the surface. -
4 BCE
Formation of The Moon
When a space debris as large as Mars struck Earth, large chunks of materials of both the asteroid and Earth started orbiting in space. As the pieces flowed in space, over time, the pieces collided with each other and became the moon. -
4 BCE
Earth's Core Form
As the outermost layer of crust formed, the inner layers of the Earth were still hot and molten. In the center, there is a heat source that releases all the heat that is now known as the core of Earth. -
4 BCE
Planetary Cooling
As the molten Earth cooled down, a thin layer of crust formed on top of the inside, molten part of the Earth. The layer crust became the outermost layer of Earth, which we stand on today -
4 BCE
Planetary Accretion
Planetary accretion was the process of Earth forming. As the meteors and comets left, the solar nebula kept colliding. It made the early, hot, chaotic, and molten Earth full of volcano eruptions and even more collisions.