is the entire world made originally from water?
Early Earth âwas covered in waterâ. Earth was once a âwaterworldâ much like the one depicted by Hollywood, scientists believe. A new model of the early Earth suggests that until around 2.5 billion years ago oceans covered almost the whole of the planet. Just 2% to 3% of the Earthâs surface would have been dry land, compared with 28% today.