Save guides, add subjects and pick up where you left off with your BBC account. North America is the third largest continent in the world. It is located in the Northern Hemisphere. The north of ...

The Midcontinent Rift is a giant tear that formed in what is now the U.S. Midwest 1.1 billion years ago. Nicknamed North ...

Scientists have mapped seismic stress across North America in unprecedented detail ... a Stanford geophysics professor behind the new map, said in a press release. Zoback and his team described ...

Caption Most of the gravity highs on this map (hot colors for high; cool ones for low) correspond with mountains or other topographical features. But the long snake-like gravity high heading south ...