Ah. Wait till you get to third/fourth year. It all goes on it's head then.
Sorry, I didn't realise I needed to spell everything out. Obviously the state of the planet in the Hadean is purely theoretical. We don't know. The other key point is your failure to distinguish between what happened (which is relatively straight forward to model and/or deduce) and how it happened (where we really have nothing but guesswork). For example, at some point, plate tectonics started (we can see evidence of this today so it must be true). How they started? No way of knowing as there is next to nothing left from that far back in history. And formation of the Earth is at least 700 Ma earlier than that.