Final answer:
Lennox describes an 'unruly' night with calamitous weather and eerie sounds that serve to underline the theme of unnatural events and chaos following King Duncan's assassination in 'Macbeth'.
Step-by-step explanation:
The strange events described by Lennox reinforce the unsettling atmosphere and chaos following King Duncan's assassination in Macbeth. Lennox speaks of how the night was 'unruly', with chimneys blown down, lamenting voices heard in the air, and strange screams of death. These occurrences contribute to the theme of unnatural events reflecting the social and moral disorder of the time.
The violent disturbances of nature mirror the upheaval in the human realm, emphasizing the gravity of Macbeth's regicide. The night's chaos, as related by Lennox, underscores a world turned upside down by Duncan's unnatural and untimely death—presaging the downfall and chaos that will follow in the kingdom as a result of Macbeth's crimes.