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Transcript
Volcanology LO: Review past questions Test plate boundary knowledge Know the types of lava and their characteristics Plate Boundary Test Convection Current Direction Collision Conservative Destructive O/C Destructive O/O Constructive O/O Constructive C/C Plate Movement Direction Plates Features involved Rate of movement Map • • • • • Mark on examples of: Island arcs Trenches Fold Mountains Ocean Ridges Types of lava • Lava produced by the upward movement of materials from the mantle is BASALTIC and tends to be located: • Along mid ocean ridges • Over hot spots • Alongside rift valleys Types of Lava • Lava resulting from the process of subduction is described as ANDESITIC and occurs as/at: • Island arcs • Destructive plate boundaries where oceanic crust is being destroyed and gases are being added Basaltic Lava • • • • • • • • • • • • Low viscosity Hot (1200 degrees celsius) Runny Low silica content (45-52%) Takes a long time to cool Retains gas which makes it mobile Gentle sloping large features Frequent but gentle eruptions Lava and steam erupted Constructive PBs Fissures (Heimaey, Mid Atlantic Ridge, Iceland) Hot spots (Mauna Loa, Hawaii) Acidic Lava • • • • • • • • • Viscous Cooler (800 degrees celsius) Slow flowing Cools quickly Loses gas quickly, becoming sticky Steep-sided features Less frequent but violent eruptions (gas build up) Ash, rock, gas, steam and lava erupted Destructive plate boundaries where oceanic crust is destroyed • Subduction (Mt St Helens) • Island arcs (Mt Pelee, Martinique) Lava Footage • http://www.youtube.com/watch?v=xExdEX OaA9A • http://www.youtube.com/watch?v=U3Pyux hzGow • http://www.youtube.com/watch?v=CxvtV7a NMT0&feature=fvw • http://www.youtube.com/watch?v=p8CHS ThR-Mo&feature=related Volcanoes and lava type • http://kids.discovery.com/games/pompeii/p ompeii.html