| A | B |
|---|
| amount of water vapor | factor that determines whether a volcano eruption will be quiet or explosive and other gases trapped in the magma |
| composite volcano | Mount Saint Helen is an example of |
| volcanic neck | Ship Rock in New Mexico is an example of |
| 600 | Of the Earth's volcanoes this many are active |
| less dense | Magma is forced upward to Earth's surface because it is.....than surrounding rock |
| Pacific Ring of Fire | Many active volcanoes form around the edge of the Pacific Plate forming |
| sill | Magma that squeezes into horizontal cracks and hardens forms |
| dike | magma that squeezes into vertical cracks and hardens forms |
| batholith | the largest intrusive igneous rock body is |
| caldera | If the top of a volcano collapses into the partially emptied magma chamber forms |
