| A | B |
|---|
| dormant | a volcano may erupt at some point in the future |
| extinct | a volcano that will not erupt again |
| active | the volcano that currently or is likely to emit gas or lava |
| magma | molten material under the earth |
| lava | what magma is called when it reaches the surface |
| focus | the point beneath Earth’s surface where rock under stress breaks to cause an earthquake |
| epicenter | the place on earth’s surface directly above the focus |
| seismic waves | waves that carry the energy of an earthquake away from the focus |
| shield cone | erupts more quietly than other volcano types |
| composite volcano | erupts both explosively and quietly |
| cinder cone | ash, cinders, and bombs build up in a steep pile to form this type |
| plate boundaries | most of Earth's volcanoes are found along these |
| Hawaiian Islands | this island chain developed over a hot spot |
