Snowball Earth' Scenario Plunged Our Planet Into Million-Year Winters | Space
An asteroid may have turned ancient Earth into a snowball
Geology Notes - The Snowball Earth hypothesis proposes that Earth's surface became entirely or nearly entirely frozen at least once, sometime earlier than 650 Mya (million years ago). The snowball Earth episodes
How Earth Might Have Turned Into a Snowball - The New York Times
Snowball Earth, ou comment se faire des amis après l'apocalypse
How Did Life Survive on Snowball Earth? The Answer Lies in Antarctica » Explorersweb
How Earth Might Have Turned Into a Snowball - The New York Times
The story of Snowball Earth
NASA GISS: Research Features: "Snowball Earth" Might Have Been Slushy
How "Snowball Earth" led to the evolution of complex life
A Perfect Storm of Fire and Ice May Have Led to Snowball Earth | Harvard University Center for the Environment