| A | B |
|---|
| volcano | vent or fissure in the Earth's surface |
| magma chamber | stores molten rock inside a volcano |
| vent | opening at Earth's surface |
| Aa | jagged pieces of lava |
| pahoehoe | lava with high viscosity, looks like wax |
| pillow | lava which forms underwater |
| blocky | cool, stiff lava; looks like jumbled chunks |
| pyroclastic material | comes from an explosive eruption |
| shield volcano | spreads out over a wide area |
| cinder cone volcano | forms steep slopes |
| composite volcano | has broad base, side get steeper at the top |
| crater | funnel shaped pit near the top of the volcano |
| caldera | forms when the roof a a magma chamber collapses |
| lava pateau | flat landform made from many nonexplosive eruptions |
| rift zone | deep cracks that form between divergent plates |
| hot spot | volcanically active area far from a plate boundary |
