Glaciation refers to the formation of huge ... it changes the landscape around it over time - a very, very long time. As they move along, glaciers can pick up pretty much anything in their path ...

providing new clues about a mysterious shift in glacial cycles. For years, scientists believed the North Sea was shaped by multiple smaller ice sheets advancing and retreating over time.

Thermochronology allows researchers to estimate the temperature that mineral crystals experience over time ... of missing time," said Keller. "Our research demonstrates that only glacial erosion ...