| Term | Definition |
|---|
| batholith | largest intrusive igneous rock body |
| caldera | large depression after a volcano collapses |
| cinder cone volcano | steep sided loosely packed; explosive eruption |
| composite volcano | lava and tephra in alternating layers; quiet and explosive |
| dike | magma that is forced into a crack that cuts across rock layers and hardens |
| crater | steep-walled depression around a volcano's vent |
| hot spot | unusually hot area that melts rock and causes it to be forced toward the surface |
| shield volcano | broad volcano, gently sloping sides; quiet eruption |
| sill | rock that is forced into a crack parallel to rock layers and hardens |
| tephra | bits of rock or solidified lava dropped from the air |
| vent | opening at Earth's surface |
| volcanic neck | after a volcanic cone erodes, it leaves behind the solid igneous core |
| volcano | opening in Earth that erupts gases, ash, and lava |
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