| A | B |
|---|
| pahoehoe | lava that has a smooth billowy surface |
| aa | lava that has a rough surface |
| tiltmeter | an instrument that uses liquid to register changes in the earth |
| hot spot | a place on earth directly above a column of rising magma |
| caldera | a large circular depression |
| pluton | a body of magma that has hardened underground |
| subduction zone | a place where one tectonic plate is pushed under another tectonic plate |
| shield volcano | a gentle slope spread over a wide area |
| cinder cone | a small cone-shaped volcano built of ash and cinders |
| composite volcanoes | a steepsided volcano composed of lava, ash and cinders |
| volcanic bombs | blobs of molten rock that are lobbed into the air by a volcano |
| laccolith | formed from large puddles of magma and has a dome shape |
| batholith | Found deep in the earths crust and can have a surface area of 100 squared km |
