The cold periods - or ice ages - are times when the entire Earth experiences notably colder climatic conditions. During an ice age, the polar regions are cold, there are large differences in ...

See also how these coasts looked 20,000 years ago at the height of the Ice Age, when seas were 400 feet lower than today, as well as how they would appear if the much larger East Antarctic Ice ...

Nick on the Rocks is available to stream on pbs.org and the free PBS App ... and this is an incredible place to study the Ice Age. Thousands upon thousands of granite boulders, laid here low ...