If the Earth’s oceans did not come from asteroids but existed with Earth, then some problems would have been solved. The first problem is why there is so much water on Earth, and the second is why living things that need water start to form as soon as the earth’s surface solidifies. The latest theory is that the oceans have always been in the interior of the earth since the beginning of the world. Earth’s crust causes the water inside it to rise to the surface, forming oceans. In this way, the waters of the earth’s crust and the oceans on the surface of the earth are in rotation.
In fact, it is possible that the Earth’s water came together in the interior of the Earth from the beginning of the world, or that it came from ice from asteroids, which combined to cover 70% of the Earth’s surface. It is unknown at this time what percentage of water is present in each of the two cases and how to determine the percentage. Therefore, this puzzle will take some time.