Final answer:
The letters ‘s’, ‘c’, and ‘a’ are associated with the coldest air, where ‘s’ is found in several words denoting cold, and ‘c’ and ‘a’ appear in words like ‘coldest’ and ‘Antarctica’, the latter being where the coldest temperatures on Earth are recorded.
Step-by-step explanation:
The coldest air is associated with the letters s, c, and a. For instance, when underlining the letters that spell ‘s’ in the words provided (asked, century, coldest), we can see the letter ‘s’ appears in all three words. Additionally, the letter ‘c’ in coldest and ‘a’ in Antarctica are associated with cold regions and conditions.
Specifically, Antarctica experiences the coldest winter temperatures on Earth, and this extreme cold is instrumental in the formation of polar stratospheric clouds, which have a strong affinity for CFC molecules due to their cold-induced electrostatic attraction. Moreover, the excerpt from a text mentioning the coldness settling into the room during October 1937 indirectly relates to these letters through the sensation and visual representation of cold.