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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 |