Geology of the United States
Videos
The richly textured landscape of the United States is a product of the dueling forces of plate tectonics, weathering and erosion. Over the 4.5 billion-year history of the Earth, tectonic upheavals and
The exposed granite of the Sierra was formed deep underground.
Mammoth Hot Springs is evidence of Yellowstone thermal activity
The Basin and Range province, in central Nevada, as seen from space.
Cedar Mesa Sandstone forms the Druid Arch, in Canyonlands National Park
Gondwana
Videos
Gondwana was a large landmass, sometimes referred to as a supercontinent. The remnants of Gondwana make up around two-thirds of today's continental area, including South America, Africa, Antarctica, A
Reconstruction showing final stages of assembly of Gondwana, 550 Mya
Geology of Asia 450.Ma
Geology of Asia 350Ma
Geology of Asia 300Ma