Learn about earthquakes and volcanoes and how the earth's surface is always changing.

About earth movement and plate tectonics, and the possibility of earthquakes at the Cascadia Subduction Zone, an area between British Columbia and northern California. No one ever thought the Pacific Northwest was due for an earthquake, let alone a catastrophic one. But geologists are transforming our understanding of the grave dangers the population in the region of Cascadia facewill there be a big one? And what can be done to save lives? America's...