A time on earth when most of the land is covered with frozen rain?

A time on Earth when most of the land is covered with frozen rain could refer to the Ice Ages, particularly during the last glacial maximum around 20,000 years ago. During this period, vast regions, especially in the Northern Hemisphere, were covered in thick ice sheets and glaciers, resulting in a dramatically colder climate. In addition to glaciers, frozen rain or sleet could have contributed to the frigid conditions, affecting ecosystems and human habitation. These conditions significantly shaped the landscape and influenced species evolution.