- The ensuing theory, known as plate tectonics, has had a major impact on Earth Sciences. It represents a scientific revolution as significant to geology as relativity was to physics. This activity ...
- Movement in narrow zones along plate boundaries causes most earthquakes. Most seismic activity occurs at three types of plate boundaries—divergent, convergent, and transform. As the plates move past each other, they sometimes get caught and pressure builds up. When the plates finally give and slip due to the increased pressure, energy is released as seismic waves, causing the ground to shake.
- Red lines are spreading boundaries, where new crust is generated as plates move away from one another; black lines are transform faults where plates slide past one another. Black lines with sawteeth are convergent boundaries, where one plate dives beneath another in direction of sawteeth.