Ice Age
An Ice age is a period of time when colder global temperatures causes glaciers to expand across the planetary surface. There have been at least five significant ice ages in the history of the Earth - the most recent was called the Last Glacial Period from approximately 120,000-11,500 B.P. (Before Present). Humans (Homo sapiens) emerged approximately around 300,000 B.P. in Africa and lived through two of them.