| A | B |
|---|
| volcano | A weak spot in the crust where magma has come to the surface |
| Ring of Fire | A major belt of volcanoes that rims the Pacific Ocean |
| island arc | A string of islands formed by the volcanoes along a deep ocean trench |
| hot spot | an area where magma from deep within the mantle melts through the crust above it |
| crater | a bowl-shaped area that forms around a volcano's central opening |
| vent | the opening through which molten rock and gas leave a volcano |
| side vent | sometimes magma forces its way out of a volcano through the side |
| pipe | a long tube through which magma moves from the magma chamber to Earth's surface |
| magma chamber | the pocket beneath a volcano where magma collects |
| lava flow | the area covered by lava as it pours out of a volcano's vent |
| silica | a material that is formed from the elements oxygen and silica; found in magma |
| active | a volcano that is erupting or show signs of erupting in the near future |
| dormant | a volcano that does not show signs of erupting in the near future |
| extinct | a volcano that is unlikely to erupt again |
| hot spring | a pool formed by groundwater that has risen to the surface after being heated by a nearby body of magma |
| geothermal energy | heat energy in Earth's interior from water or steam that has been heated by magma |
