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Chap 11 (2)
Chap 11 (11-4,5) vocabulary
| Question | Answer |
|---|---|
| magma collects in a pocket | magma chamber |
| long tube that connects chamber to surface | pipe |
| area covered by lava as it pours out a vent | lava flow |
| bowl-shaped area at the top of a volcano | crater |
| formed from oxygen and silicon- abundant | silica |
| fast-moving, hot lava | Pahoehoe |
| cooler, and slow-moving | aa |
| explosive eruption - ash, cinders, bombs | pyroclastic flow |
| live, erupting | active volcano |
| sleeping, not erupting | dormant volcano |
| water heated by magma, as an energy source | geothermal energy |
| fountain of water and steam that erupts from the ground | geyser |
| forms when magma hardens in a volcano pipe | volcanic neck |
| mass of rock formed when large body of magma cools inside the crust | batholith |
| magma that forces its way across rock layers and hardens | dike |
| magma squeezes between layers of rock | sill |
| wide, gently sloping (can rise from hot spot)ex. Hawaiian Islands | shield volcano |
| steep, cone-shaped (lava thick and stiff)ex. Paricutin in Mexico) | cinder cone volcano |
| tall, cone-shaped (layers of lava and ash alternate) ex. Mt. Fuji or Mt. St. Helens | composite volcano |
| high, level area (lava flows out of cracks) ex. Columbia Plateau | lava plateau |
| huge hole left by the collapse of a volcanic mountain | caldera |