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en.wikipedia.org/wiki/History_of_the_Earth

While the Earth was in its earliest stage (Early Earth), a giant impact collision with a planet-sized body named Theia is thought to have formed the Moon. Over time, the Earth cooled, causing the formation of a solid crust, and allowing liquid water on the surface.

www.space.com/19175-how-was-earth-formed.html

Earth's rocky core formed first, with heavy elements colliding and binding together. Dense material sank to the center, while the lighter material created the crust. ... Early in its evolution ...

courses.lumenlearning.com/sanjac-earthscience/chapter/early-earth

Earth and the other planets in the solar system formed about 4.6 billion years ago. The early Earth was frequently hit with asteroids and comets. There were also frequent volcanic eruptions. Both were sources of water and gases for the atmosphere; The early Earth had no ozone layer, no free oxygen, and was very hot.

www.thoughtco.com/birth-of-the-earth-1441042

At one point early in this process a very large planetesimal struck Earth an off-center blow and sprayed much of the young Earth's rocky mantle into space. The planet got most of it back after a period of time, but some of it collected into a second planetesimal circling Earth.

en.wikipedia.org/wiki/Early_Earth

The early Earth (sometimes referred to as Gaia) is loosely defined as Earth in its first one billion years, or gigayear. [better source needed] On the geologic time scale, this comprises all of the Hadean eon (starting with the formation of the Earth about 4.6 billion years ago), as well as the Eoarchean (starting 4 billion years ago) and part of the Paleoarchean (starting 3.6 billion years ...

serc.carleton.edu/NAGTWorkshops/earlyearth

A workshop, Teaching about the Early Earth: Evolution of Tectonics, Life, and the Early Atmosphere was held on April 12-14, 2007 at the University of Massachusetts, Amherst, MA. This workshop brought together experts in early earth research and geoscience education to explore opportunities to bring this exciting research into undergraduate classrooms.

eesc.columbia.edu/courses/ees/climate/lectures/earth.html

A second line of evidence, to suggest that the early earth had a reducing atmosphere like Venus and Mars, is the presence of detrital (formed from the products of erosion of pre-existing rocks) pyrite in sedimentary deposits older than two billion years old.

www.khanacademy.org/.../history-life-on-earth/v/earth-formation

It would actually have been a very violent process, actually happened early in Earth's history, and we actually think this is why the Moon formed, so at some point you fast-forward a little bit from this, Earth would have formed, I should say, the mass that eventually becomes our modern Earth would have been forming. Let me draw it over here.

www.livescience.com/46593-how-earth-formed-photo-timeline.html

Photo Timeline: How the Earth Formed . ... It's hard to know when the Earth first formed, because no rocks have survived from the planet's earliest days. ... Early Earth's Spin Helped Shape Its ...

www.youtube.com/watch?v=uHUTbq-j0UU

As the cooling continued, water vapor began to escape and condense in the earth's early atmosphere. Clouds formed and storms raged, raining more and more water down on the primitive earth, cooling ...