| A | B |
|---|
| volcano | mountain of lava and ash |
| convergent boundary | plates move together |
| divergent boundary | plates move apart |
| vent | opening in the Earth's surface |
| hot spots | magma rises from the mantle |
| geothermal energy | heat from magma used to produce electricity |
| hot dry rock | water pumped down into deep fractured rock |
| basaltic magma | little silica, nonexplosive eruptions |
| granitic magma | much silica, explosive eruptions |
| shield volcano | broad, flat, gently sloping sides |
| cinder cone volcano | steep-sided, loosely consolidated |
| tephra | volcanic material of different sizes |
| composite volcano | alternating layers of lava and tephra |
| batholith | largest intrusive igneous bodies |
| dike | magma that hardened in a vertical crack |
| sill | magma that hardened in a horizontal crack |
| volcanic neck | solid igneous rock core of a volcano |
| caldera | collapsed crater on top of a volcano |
