Even the balmy tropics may have once been crushed by colossal masses of ice.

The ancient Greek thinker Anaximander lent his prodigious talents to pre-Socratic Greek philosophy, geography, geometry, and cosmology.

This study presents the first physical evidence that Snowball Earth reached the heart of continents at the equator.' ...

If oceans didn’t exist and there was only land between continents, traveling around the world would look very different! We’d likely have huge, continuous landscapes with forests, deserts, mountains, ...