Question | Answer |
Lava is liquid rock (magma) that flows out of a volcano. Fresh lava glows red hot to white hot as it flows. | lava
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Magma is liquid rock inside a volcano. | Magma
| Pumice is a light, porous volcanic rock that forms during explosive eruptions. It resembles a sponge because it consists of a network of gas bubbles frozen amidst fragile volcanic glass and minerals. | pumice
| The mantle is the zone of the earth below the crust and above the core. | mantle
| An extinct volcano is a volcano that is no longer active. | Extinct Volcano
| An active volcano is one that erupts regularly. | Active Volcano
| A dormant volcano is one that has not erupted for many years, although there is still some activity deep inside. | Dormant Volcano
| Ash is fine particles of rock dust blown from an explosion vent. | ash
| An Ashfall is volcanic ash that has fallen through the air from an eruption cloud. | ashfall
| A vent is an opening at the Earth's surface of a volcanic conduit. | vent
| A conduit is a passage (pipe) followed by magma in a volcano. | conduit
| A crater is a steep-sided, usually circular depression formed by either explosion or collapse at a volcanic vent. | crater
| An eruption is he process by which solid, liquid, and gaseous materials are ejected into the earth's atmosphere and onto the earth's surface by volcanic activity. | eruption
| A fault is a crack or fracture in the earth's surface. | fault
| Fissures are elongated fractures or cracks on the slopes of a volcano. | fissures
| Geysyers are springs that throw boiling water high in the air. They are caused by volcanic heat warming trapped groundwater. | geysers
| A debris flow (also called a mudflow or lahar) is a moving mixture of rock, water, and other debris. | debris flow
| A magma chamber is an underground cavity filled with gas-rich magma (molten rock). | magma chamber |