WarmUp Thurs 220 Write What You Know Write

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 Major Key Term Volcanic Landforms Notes definition in own words Key Term • definition in own words • facts • pictures

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