| A | B |
|---|
| What are small bits of lava that harden before they hit the ground called? | lapilli |
| What is below a volcano? | magma chamber |
| What is the most common type of eruption? | nonexplosive eruptions |
| How fast can a pyroclastic flow go? | 200 km/hr or 124 mi/h |
| What forms when gases trap in magma or lava form bubbles? | volcanic ash |
| What is any place where gases and magma come out of the ground? | volcano |
| What kind of eruption was Mount St. Helens? | explosive volcano |
| What is the name of molten rock inside a volcano? | magma |
| What affects how explosive a volcanic eruption is? | composition of lava |
| What is most likely to happen if the water content of magma is high? | An explosive eruption is likely. |
| What is ash? | tiny dust-size bits of rock |
| What is a vent? | a crack in the Earth's crust |
| What is pyroclastic material? | It is hardened magma that is blasted into the air. |
| What is a volcanic bomb? | It is a large blob of lava that harden in the air. |
| How can magma that contains a lot of silica cause an explosive eruption? | A lot of pressure builds up and the volcano explodes. |
