| A | B |
|---|
| Volcano | A landform, usually cone-shaped, produced by a collection of erupted material around a vent, or opening, in the surface of the earth and through which gas and erupted material pass. |
| Volcanologist | A scientist who studies volcanoes and volcanic phenomena. |
| Lahar | Mudflow that occurs when rain falls through clouds of ash or when rivers become choked with fallen volcanic debris. |
| Crater | A small, bowl-shaped hole that forms when rock explodes from a volcano during an eruption |
| Magma | Molten rock within the earth. |
| Lava | Molten rock on the earth’s surface. |
| Lava Dome | A bulbous, steep-sided dome that forms at the top of a volcano when thick, relatively “cold” magma emerges from the volcanic opening. |
| Lava Flow | Lava that flows quickly over the surface of the earth and covers a wide area. |
| Mudflow | A powerful “river” of mud that forms when debris, such as from a volcanic eruption, moves into a stream or river. |
| Geologist | A scientist who studies the history and structure of the earth as it is recorded in rocks. |
