The Ice Age Has Nothing on ‘Snowball Earth’
This article was originally published in Hakai Magazine.Planet Earth used to be something like a cross between a deep freeze and a car crusher. During vast stretches of the planet’s history, oceans from pole to pole were covered with a blanket of ice a kilometer or so thick. Scientists call this “snowball Earth.”Some early animals managed to endure this frigid era from roughly 720 million to 580 million years ago, but they had their work cut out for them.



























