Glaciation refers to the process of when large masses of ice, known as glaciers, form and spread over a land area. It occurs due to long periods of cold temperatures where snow accumulates and compacts into ice. Full definition
Linked by a single root system, Pando consists of tens of thousands of genetically identical trees, cloned from a sprout that emerged after the last glaciation in southern Utah, roughly 13,000 years ago. (discovermagazine.com)
The closing of the Central American Seaway initially may have warmed Earth's climate, but then set the stage for glaciation in the Northern Hemisphere at 2.7 million years ago. (whoi.edu)
The second clue is that Northern Hemisphere glaciation intensified between 3.1 and 2.5 million years ago, thanks to all the moisture delivered to the far north via evaporation from a more vigorous Gulf Stream. (williamcalvin.com)