GEO 1111 Lecture 6: GEO1111

• School: University of Ottawa
• Department: Geology
• Course: GEO 1111
• Professor: David Schneider

Document Summary

Cause concern: death, transportation disruption (iceland) Pure science: deep materials brought to the surface. Fertile soil: wine growing regions are on volcanic sourced crust. Economic: precious metals" origins are volcanic. Moral: volcanoes are not always bad (but normally are kind of bad) Shield volcano: broad, relatively low, like a shield, little pyroclastic material, slow eruption of materials, slopes angles are gentle, size (diameter) is large, largest one is on mars, olympus mons. Composite cone/ stratovolcano: layered pyroclastic eruptions and viscous lava flows, often produces a nue ardent, most violent eruption, mount fuji, mt. Rainer: 000"s of meters high, several km wide at base. Cinder cone/ pyroclastic: tephra and lose pyroclastic material, small steep sided, sunset crater. Lava dome/ volcanic dome: bulbous mass of congealed lava, most are associated with explosive eruptions of gas poor magma. Most active volcanoes are located within or near ocean basins. Volcanoes produce new material called igneous rock.