| A | B |
|---|
| magma | molten mixture in Earth's mantle |
| Ring of Fire | belt of volcanoes around the rim of the Pacific Ocean |
| silica | determines thickness of magma |
| pyroclastic flow | explosive eruption hurling ash, cinders, bombs |
| shield volcano | gently sloping mountain |
| volcanic neck | magma hardens in volcanic pipe and is later exposed |
| Olympus Mons | largest volcano in solar system |
| Io | volcanoes erupt fountains of sulfur |
| volcano | weak spot in the crust where magma comes through |
| Pahoehoe and aa | produces quiet eruptions |
| geyser | hot water and steam that erupts from the ground |
| caldera | top of a volcanic mountain collapses |
| batholith | mass of rock formed when a large body of magma cooled inside Earth's crust |
| hot spot | where magma melts through the crust |
| magma chamber | magma collect in a pocket |
| gas, temperature, silica | factors that affect magma |
| volcanic soils | contain potassium and phosphorus |
| lava plateau | layers of thin, runny lava that flow over a wide area before cooling |
| active | volcano that is erupting |
| composite volcano | alternating layers of lava then ash, cinders, bombs |
