Colorado
'Snowball Earth:' Entire planet was likely covered in ice more than 600 million years ago
New evidence found in the Rocky Mountains of Colorado supports the notion that Snowball Earth was indeed a global phenomenon.
Some 700 million years ago, Earth might have looked something like this.
Anyone living on Earth between 720 million and 635 million years ago probably would've needed a jacket.
Geologists have long suspected that Earth's temperature dropped dramatica... [3036 chars]