Hadean

hadean is period of the Earth ongoing 100 millions years. Young earth then it was no different from other objects, it began to change when the moon was formed.

origin of the moon
The moon was formed when the planet theia hit the Earth, huge amounts of rock material was ejected and the moon was formed from this material.

first water
water on Earth appeared by comets and asteroids from the great bombardment that began several million years after theia hit Earth