1. Volcanoes Some Key Terms

2. Plate Tectonics Separating ASH CRATER LAVA SIDE VENT CRUST MAGMA CHAMBER

3. Types of Eruption Quiet Eruption Explosive Eruption Fissure Flows Intermediate Eruption

4. Quiet Eruption Low pressure, lava pours out in steady stream and thinly, calm –often called Hawaiian –produces a shield cone - wide base, and gentle, convex slope –gases emitted slowly

5. Shield Cone

6. Explosive Eruption Great violence, often earthquakes or loud rumblings preceding the eruption Volcanic bombs (pyroclastics) Produces a cinder cone - narrow base, steep side Volcanoes not very high because material is loosely organized –e.g.Krakatoa 1883

7. Pyroclastic

8. Cinder Cone

9. Fissure Flows An open crack in solid surface produces a lava plateau or plain many kilometres wide –looks like a ribbon of magma/fire Produces a flood basalt "cone" or lava plateau

10. Fissure Flows When it erodes it "candles" like fresh water ice in hexagonal columns!!! –Ireland - Giant's Causeway

11. Fissure Flow

13. Flood Basalt

14. Intermediate Eruption Also called Strombolian - a combination of quiet and explosive eruptions A combination of lava and rock fragments in alternating layers (produces pyroclastics during explosive phase) Produces a composite cone or stratovolcano

15. Stratovolcano

16. What kind of eruption produces a… Explosive Eruption Intermediate Eruption Quiet Eruption