_D705326_JS_Send.jpg (Photo: Jorge Santos)
More on VolcanoDiscovery:
Etna's steam rings
: A collection of fantastic vortex rings ("smoke rings") we observed recently on Etna.
Photos from volcanoes all over the world, taken during our expeditions.
Introduction to Plate Tectonics
: The Earth's upper, rigid layer is broken into several plates which are in constant motion to one another. Most earthquakes and volcanoes occur as result of these plate boundaries.