Minnesota's lakes may be its most famous features, but the glaciated countryside disguises a much longer history of volcanoes and plate collisions--not surprisi

With this newly updated, colorful, and lively guide, Glacier National Park visitors can take a self-guided tour of the fascinating geologic events that created

The Silver State has some of the most diverse geology in the United States, and much of it lies in plain sight thanks to the arid climate of the Great Basin. --

Tennessee, extending 500 diagonal miles between Bristol and Memphis, cuts across numerous rock types, from the deformed gneiss of the Blue Ridge along the North