Early conditions PERSON@1 and PERSON@2 have suggested that oceans may have appeared first in the Hadean era , as soon as two hundred million years -LRB- NUMBER@1 Ma -RRB- after the LOCATION@1 was formed , in a hot reducing environment , and that the pH of about NUMBER@2 rose rapidly towards neutral .

The pH was about NUMBER@2 at first , but it rapidly rose towards neutral .
