Warm-Up: Thurs 2/20 Write What You Know!

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Presentation transcript:

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?

2/24/2014 Volcanic Landforms Notes Major Key Term Key Term definition in own words Key Term definition in own words facts pictures Key Term

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!)

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