| A | B |
|---|
| volcano | geological landform where magma erupts through the surface of the planet |
| plates | huge slabs of the Earth's crust which fit together like a jigsaw puzzle |
| fissures | narrow cracks in the Earth's crust |
| magma | liquid rock inside a volcano |
| lava | liquid rock that flows out of a volcano |
| active volcano | one that erupts regularly |
| dormant volcano | one that has not erupted for many years, although there is still some activity deep inside |
| extinct volcano | one that has ceased to be active |
| vocanic eruption | when hot rocks and lava burst from a volcano |
| geysers | springs that throw boiling water high in the air |
| Mauna Loa | the world's largest, active volcano |
| ash | finely powdered rock that looks like dark smoke coming from the volcano |
| cinders | bits of fragmented lava |
| pumice | light-weight rock that is full of air bubbles |
| Mt. St. Helen | the most active volcano in the continental USA |
| flank | the sides of the volcano in which the lava flows |
| vent | the opening through which molten rock and gases escape from a volcano |
| crater | the bowl-like opening of a volcano |
| conduit | the name of the tube through which molten rock flows |
| crust | part of the Earth where you would find a magma reservoir |
