| A | B |
|---|
| aa | slower moving lava with rough jagged surfaces |
| andesitic magma | intermediate viscosity & silica (60%) sometimes explosive |
| basaltic magma | least viscous lowest silica (50%) rarely explosive magma |
| caldera | collapsed volcano forming a large crater shaped basin |
| cinder cone | formed from molten lava thrown into air from a vent |
| composite volcano | formed from layers of materials from successive eruptions |
| hot spot | areas of volcanic activity resulting from plumes of hot material rising from mantle |
| lahar | hot ash mixed with snow and ice causing a fast moving mudslide |
| lava | magma that reaches the Earth's surface |
| lava plateau | lava from a fissue spreads across surface of land |
| pahoehoe | quick moving lava with smooth ropelike surface |
| pillow lava | lava cooled underwater takes a distinctive rounded shape |
| pyroclastic flow | gases and solid fragments released in a volcanic eruption |
| pyroclastic material | dense superheated cloud of fragments and gases travelling donhill from a volcanic eruption |
| rhyolitic magma | most viscous & silica (70%) most explosive |
| shield volcano | broad based gently sloped volcano built from slow moving lava layers |
| viscosity | resistance to flow in magma |
| volcano | opening in Earth's crust releasing molten rock gases ash |
| mauna loa | example of a shield volcano |
| mount shasta | example of a composite volcano |
| capulin | example of a cinder cone |
| crater lake | example of a caldera |
