Giant glaciers scraped parts of the Earth's crust, releasing key minerals into the ocean millions of years ago, a study published in Geology found.

During the Cryogenian, our planet was plunged into a series of deep freezes when enormous glaciers flowed across the globe. In new research published in Geology, we show that these crushing rivers of ice,

Earth was a very different place during its Cryogenian period, around 700 million years ago. It was covered head-to-toe in kilometers-deep dice as huge frozen rivers churned across the planet’s rocky surface.