What dramatic elements emerge at the beginning of scene 3?

In Act 1, Scene 3 of "Macbeth," the dramatic elements that emerge include the introduction of the witches, who foreshadow Macbeth's rise to power and downfall. The witches' prophecies create suspense and drive Macbeth's ambition to become king. The supernatural elements in this scene contribute to the overall atmosphere of darkness and evil that pervades the play.