| A | B |
|---|
| three | the majority of major earthquakes and volcanic eruptions occur in this many zones of the world. |
| two | lava is classified into this many catagories |
| cinder cone volcano | a volcano that is gently slopping and not packed solidly |
| caldera | a large crater resulting from the collapsing of the wall of a volcano |
| 1980 | the year Mount St. Helens erupted |
| fire mountain | the name given to Mount St. Helens by the indians |
| crystallizes | what the magma does as it is held in the reservoir for decades to centuries |
| glaciers | what was melted on the mountain side and caused mudslides |
| 150 | How far ash from Mount St. Helens spread in 2 hours |
| Cascade Range | the mountain range that contains Mount St. Helens |
| sunsets | vocanic ash can cause these to be spectacular |
| pyroclast | this word means firey fragments |
| ripped them out of the ground | what the initial blast of Mount St. Helens did to trees |
| burning shoes | what lava that looks cool , but isn't smells like |
| sulfur | the element that makes up most vocanic gases |
| methane | the gas that results form the decomposing of arganic matter as lava covers it |
| steam | was sea water becomes as lava flows into it |
| sudden movements of part of the earths crust | what earthquakes are caused by |
| focus | the point beneath the earth's surface where the earthquake begins |
| faulting | what most earthquakes are caused by |
| P waves | the earthquake waves that arrive at the surface before any others |
| S waves | travel through solids but not liquids |
| epicenter | where the most violent shaking occurs during an earthquake |
| The San Andreas Fault | what caused the San Francisco earthquake |
| tsunami | a giant wave caused by an earthquake |
| L waves | the slowest of the earthquake waves |
| 10 | the strongest earthquake can be measured this on the Richter scale |
| lava | magma that has come to the earth's surface |
| volcanic eruption | a violent discharge of ash from the the earth |
| Mt. Etna | a famous composite volcano in Italy |
