How do volcanoes work? What happens beneath their surface? What causes the vibrations—known as tremor—that occur when magma or gases move upward through a volcano's conduits? Professor Dr. Miriam ...

Think of a volcano as a soda can. Shake the can, and gas and pressure build up inside. Open the top and bam! — an explosion occurs. Volcanoes work much the same way. The heat deep inside Earth is so ...