Snow sculpted into fanciful shapes such as doughnuts and hollow tubes appear overnight.
A global ice age that lasted more than 50 million years may have been triggered by volcanic rocks trapping carbon dioxide.
One geologist thinks Earth has been banged up a bit more than previously thought -- never allowing the 'Snowball Earth' global ice age to develop.
Sea level is rising today, but a long, long time ago sea levels dropped to alarming, but hard to pinpoint, levels. Researchers have a new estimate of how low seas can go. Continue reading →
Tectonic rifting between continents may have provided liquid shelters for life during otherwise frozen times.