1. Shield Volcano

2. Shield Volcanos LARGEST, with gently sloping sides
High BASALT content, LOW WATER, LOW GAS, QUIET eruptions,
Often found at HOT SPOTS
Examples?
Hawaii!! Mauna Loa and Kilauea

3. Cinder Cones
Paracutin, below, Mexico

4. Cinder cones SMALLEST of the volcanos
VERY steep sides, usually less than 500 M high
Found in association with other volcanos
EXPLOSIVE! Pyroclastic material ejected from a small vent
Examples..Paricutin in Mexico, there are a lot in Arizona and around the Southwest US

5. Composite Volcanoes

6. Composite Volcanos Intermediate in size “Classic” symmetrical volcanos
Explosive (Andesitic intermediate) Followed by lava flows from less explosive eruptions.
Found at Subduction zones
Examples….lots of famous volcanos, Mt. Etna, Mt. St. Helens, Vesuvius, Mt. Rainer, Mt. Fuji,

7. Lave Dome VERY thick Lava….(Rhyolite) Too thick to flow
Lava bulges up from vent in a volcano
Can be called a PLUG

8. CALDERA

9. CALDERAS 1. Composite or Shield Volcano erupts
2. upper part of volcano collapses into now empty magma chamber
3. you get a big depression,
sometimes fills up with WATER!
4. LAKE!!!
EXAMPLE: Crater Lake, Lake Nyos,

10. Review…..

11. Review