Characters in order of appearance:
On his way from the castle, the Thane of Ross encounters an Old Man, who confirms the widespread reports of disruption in the natural world. Macduff comes into the scene and says king Duncan has been buried. He also says that his sons have fled and that the kingship has passed on to Macbeth. Notice that the prophecies mention by the witches in act 1 have been completed.
Quote by old man: