Mineral Moe manga - page 4

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The Earth had a single natural satellite orbiting around it; the Moon. The stable-isotope ratios of lunar and terrestrial rock are identical, implying that both the the Moon and the Earth have a common origin.

In the early Earth especially during the Neohadean and Eoarchean eras, the surface of the planet was bombarded with significant asteroids in an event called the Late Heavy Bombardment, occurred approximately 4.1 to 3.8 billion years (Ga) ago. While evidence of such evidence was overwritten by the Earth tectonic activity, traces of it could still be found on the Moon and other planets.

There were many theories on how water would first formed on the planet Earth. Some suggested extraterrestrial sources; where water was brought together alongside asteroids and/or comets that come crashing down the planet. Other suggested a volcanic origin that would later form moisture on the atmosphere. Nevertheless, water plays an important role for the planet as a whole; from the movement of tectonic plates to the basis of life itself.