After formation of earth main event occur on earth are given with there time.
As we know young earth is in moltan state
.In 3.5 billion year ago :
lava solidify under water and form oldest rock called PILLOW lavas.
Water come on earth surface by to sources .Internally and Extarnally.
internal resorces of water on earth was too small.
externally water com through Meteorite which are water rich and consist of 5%water.
At that time colour of water was olive green due to excess of iron.