Does the assumption that water came on earth by asteroids etc explain this above mentioned fact better?
and how? Bergin: The Earth has undergone many changes in its 4.6 billion year existence. For the first 500 million years or so the surface was bombarded by wet and dry asteroids. Much of the evolution of the Earth’s surface, such as the movement of the continents, occurred past the time when impacts were common. The movement of the continents is called plate tectonics and is due to the fact that Earth is a large planet and is capable of storing heat. This heat is what ultimately allows the continental plates to shift around — and is due to heat from radioactive elements and not impacts. Kalkion: The formation of life on earth is broadly and reasonably understood and has been explained properly. What are serious challenges to the present understanding, apart from logical gaps that can be explained in due course of time? Bergin: I actually don’t think that the formation of the Earth has is ‘broadly and reasonably understood’. The events that occurred nearly 4 billion years ago where a n
