| A | B |
|---|
| What is magma called once it reaches the surface? | lava |
| Where can a hot spot occur? | middle of plates and on or near plate boundaries |
| Where does magma leave a volcano? | vent |
| An explosive eruption occurs if magma is high in what compound? | high in silica |
| A volcano that is no longer erupting but is likely to erupt again in the future is: | dormant |
| When a volcano erupts quietly what kind of mountain forms? | shield volcano |
| A weak spot in the crust where magma comes to the surface is called what? | a volcano |
| How well a liquid flows depends on what? | it's viscosity |
| A long tube that connects a magma chamber to the surface is called what? | pipe |
| A volcano that is no longer likely to erupt is said to be what? | extinct |
| This rock can be formed from quiet eruptions: | pahoehoe or aa |
| This type of rock is formed by explosive eruptions: | obsidian or pumice |
| This type of volcano has explosive eruptions of ash, cinders, and gas, and it can build up quickly: | cinder cone |
| This type of volcano has alternating eruptions of explosive pyroclastic flows and quiet lava flows: | composite |
| What happens to viscosity as temperature increases? | viscosity decreases |
| What happens to viscosity as temperature decreases? | viscosity increases |
| Explosive eruptions of ash, cinders, and bombs are known as: | pyroclastic flow |
| What physical features is often created where two oceanic plates converge? | island arc |
| This is a major volcanic belt formed by the many volcanoes that rim the Pacific Ocean | Ring of Fire |
| This is a bowl-shaped area that may form at the top of a volcano around the central vent: | crater |
