| A | B |
|---|
| magma chamber | the pocket beneath a volcano where magma collects |
| lava flow | the area covered by lava as it pours out of a vent |
| ash | fine, rocky particles as small as a speck of dust that are expelled during a volcanic eruption |
| active | a volcano that is erupting or showing signs that it may erupt in the near future; also referred to as live |
| pipe | a long tube through which magma moves from the magma chamber to Earth's surface |
| crater | a bowl-shaped area that may form at the top of a volcano around the central vent |
| cinders | pebble-sized particles of hardened lava that are expelled during a volcanic eruption |
| dormant | a volcano that is not currently active, but that may become active in the future; also referred to as sleeping |
| vent | the opening through which molten rock and gas leave a volcano |
| pyroclastic flow | the expulsion of ash, cinders, bombs, and gases during an explosive volcanic eruption; occurs when an explosive eruption hurls out a mixture of hot gases, ash, cinders, and bombs |
| bombs | large pieces of hardened lava that are expelled during a volcanic eruption; may range from the size of a baseball to the size of a car |
| extinct | a volcano that is no longer active and is unlikely to erupt again; also referred to as dead |
