Final answer:
The phrases effectuate a tone of shock and signify the abrupt demise of the vibrant Maya society, emphasizing the suddenness of its end without implying treachery or sympathy.
Step-by-step explanation:
The phrases "all was quiet" and "profound silence" contribute to the tone and meaning of the text by creating a sense of abrupt desolation and a dramatic contrast to the once-vibrant Maya society. The use of these phrases suggests an unexpected end to the civilization. It invokes a tone of shock, emphasizing how the flourishing society could come to a sudden stop. The profound silence evokes a feeling of emptiness and loss, signifying the gravity of the situation. These phrases do not suggest sympathy or treachery but rather the stark and sudden nature of the Maya civilization's end.