A hidden shard of ancient crust has been detected where California’s San Andreas system collides with the Cascadia subduction ...

From the deepest ocean trench to the tallest mountain, plate tectonics explains the features and movement of Earth's surface in the present and the past. The theory of plate tectonics was developed ...

Before I retired, I would often take school groups on tours of the HSU Geology Department’s seismograph. We’d start out in front of the drum on display in Van Matre Hall and talk about how ...

Earth's surface is a turbulent place. Mountains rise, continents merge and split, and earthquakes shake the ground. All of these processes result from plate tectonics, the movement of enormous chunks ...

The diagram below shows the structure of the earth. In geography, taking a slice through a structure to see inside is called a cross section. Continental plates are usually quite thick (between 35 to ...