| A | B |
|---|
| lava plateau | result of layers of thin, runny lava built up |
| low silica content | results in quiet eruption |
| caldera | hole left after collapse of volcanic mountain |
| volcanic ash | fine, rocky particles |
| extinct volcano | will not erupt again |
| diverging plate boundary | where volcanoes form at a mid-ocean ridge |
| Subduction Zone | place to most likely find volcanoes |
| sill | magma forces itself between rock layers and hardens |
| lava flow | main hazard from quiet eruptions |
| magma | molten material before it reaches surface |
| lava | molten material that has reached Earth's surface |
| volcanic neck | magma has hardened in volcano's pipe |
| cinder cone volcano | ash, cinder and bombs built up in a steep pile |
| pyroclastic flow | explosive eruption |
| explosive eruption | high silica content |
| Ring of Fire | major volcanic belt in Pacific Ocean |
| composite volcano | tall, cone shaped volcano; alternating layers of ash and lava |
| Converging Plate Boundary | mountains formed along coastline |
| island arc | two oceanic plates colliding cause a string of islands |
| crater | bowl-shaped area around volcano's central vent |
| dome mountain | rising magma is blocked by horizontal layers of rock |
| batholith | mass of rock that forms when magma cools inside the crust |
