2. Warm up: What do we know about the earth’s crust and what differences there are between the two types of plates which make up the crust?

4. Where volcanoes form Subduction Zones Divergent Plates Hot Spots Magma Continental Crust Formed by plate movement Oceanic Crust Magma Continental Crust Oceanic Crust Formed by plate movement Mt St Helens Yellowstone Hawaii Axial Mt Fuji Mt St Helens Yellowstone Hawaii Axial Mt Fuji

5. Anatomy of a volcano: Draw a cross-section of a volcano with these parts Crater: A steep-sided, usually circular depression formed by either explosion or collapse at a volcanic vent. Eruption Cloud: The column of gases, ash, and larger rock fragments rising from a crater or other vent. Magma Chamber: The subterranean cavity containing the magma which feeds a volcano. Pipe: A vertical conduit through the Earth's crust below a volcano, through which magma passes Plug: Solidified lava that fills the conduit of a volcano Vent: The opening at the earth's surface through which volcanic materials issue forth Dike: Formed when magma rises into an existing fracture or crack in the volcano, and then solidifies Fissures: Elongated fractures or cracks on the slopes of a volcano.