Scientists Found the Coldest Seawater in History from when Snowball Earth Reached Freezing Temperatures of Minus 15° Celsius Earth froze over 717 million years ago. Ice crept down from the poles to the equator, and the dark subglacial seas suffocated without sunlight to power photosynthesis. Earth became an unrecognizable, alien world—a “snowball Earth,” where even the water was colder than freezing. In Nature Communications, researchers reported the first measured sea temperature from a snowbal

A new theory on what caused the 'Snowball Earth' could drastically change how we understand extreme climate. | Insider Tech