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Warm-Up: Thurs 2/20
• Write What You Know!
–Write everything you know about the prompt
below for five minutes, try for at least 3-4
complete sentences.
• What kind of magma forms explosive
eruptions? What kind of magma forms
quiet eruptions?
• definition in own words
• facts
• pictures
• definition in own words
• facts
• pictures
Volcanic Landforms Notes2/24/2014
Key Term
Key Term
Major Key Term definition in own words
Volcanic Landforms
• Shield Volcano
– wide, gently sloping volcano
– looks like a shield from the above
– formed by quiet eruptions and runny, thin lava
Volcanic Landforms
• Cinder Cone Volcano
– steep, cone-shaped hill or mountain
– formed by explosive eruptions of ash, cinders, and
bombs
Volcanic Landforms
• Stratovolcano (Composite Volcano)
– very large, cone-shaped mountain formed by
alternating quiet and explosive eruptions
– volcano layers made of alternating lava flows and
pyroclastic flows (ash, cinders)
– Most dangerous type, associated with Ring of Fire!
Volcanic Landforms
• Lava Plateau
– Thin, runny lava flowing out of fissures (long cracks)
can create high level areas made of basalt (lots of
these in Idaho!)
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Volcanic Landforms
• Caldera– a huge hole left by the collapse of a
volcanic mountain or supervolcano
Magma Landforms
• Magma Landforms– formed by magma cooling underground, then
exposed by weathering away of surface layers
– Neck: magma that hardened in volcano’s pipe, looks like a giant tooth
– Dike: magma that forced itself between rock layers vertically (up-and-down)
– Sill: magma that forced itself between rock layers horizontally (flat)
Magma Landforms
• Batholith
– Formed when a magma chamber
cools into rock deep underground,
forms core of some mountain
ranges
– Dome Mountain: uplift forces a
batholith up to form a mountain
Half-Dome
Mountain in
Yosemite
Natl. Park
