Tag Archives: North America

A NOAA weather satellite mosaic displaying northeastern America with the five Great Lakes, listed from left to right: Lake Superior, Lake Michigan, Lake Huron, Lake Erie, and Lake Ontario
c. 8000 BCE: The Majestic Great Lakes of North America

The Great Lakes, consisting of Lakes Huron, Ontario, Michigan, Erie, and Superior, form the world's largest group of freshwater lakes by surface area and the second-largest by volume. Formed from ancient rifts and glacial activity, [...]

This satellite image shows the ancient, folded, and eroded remnants of the Appalachian Mountains, depicted as brown bands, in the northeastern United States. New York City is visible just above the center right of the image.
c. 480 Million BCE: The Geological History of the Appalachian Mountains

Examines the formation and evolution of the Appalachian Mountains, tracing their origins to multiple plate collisions starting around 480 million years ago and discussing their transformation from towering peaks to the more subdued landscapes seen [...]