| A | B |
|---|
| ash & cinder blown violently | tephra |
| vocano of altering layers of lava & tephra | composite |
| magma hardened in vertical crack | dike |
| mountain forms from layers of lava and ash | volcano |
| opening through which magma flows | vent |
| magma hardened in a horizontal crack | sill |
| hot area in mantle that melts rock | hot spot |
| steep sided volcano of tephra | cinder cone |
| large opening caused by collaps of top of volcano | caldera |
| opening at top of vent | crater |
| basaltic volcano with gently sloping sides | shield |
| when magma cools under surface | batholith |
| forms when volcano erodes away leaving core exposed | neck |
| active volcanoes on earth | 600 |
| explosive eruptions and thick lava | silica rich |
| quiet eruptions and fluid basaltic lava | silica poor |
| most active volcano on earth | Kilauea, Hi |
| determines type of eruption | water and silica content |
| density of magma vs rock around it | less dense |
| gets thrown from volcano | ash, lava, gases |
