Ice __; cold periods
I believe the answer is:
ages
(Other definitions for ages that I've seen before include "Historical eras" , "Aeons" , "Times" , "Donkey's years" , "Indefinitely long time" .)
I believe the answer is:
ages
(Other definitions for ages that I've seen before include "Historical eras" , "Aeons" , "Times" , "Donkey's years" , "Indefinitely long time" .)