Major extrusive volcanic features 0.0 / 5 ? GeographyPlate tectonicsNatural hazardsA2/A-levelAQA Created by: bethanymcguireCreated on: 01-06-17 20:19 Fissure Constructive Basaltic gently sloping sides, only a few meters wide but many kilometers long can create lava plateaus as it spills onto the surface -Iceland, north american and eurasian plates, mid altantic ridge -laki 1783/4 50% of the livestock died and 25% of the population died as well as due to widespread famine. 14km long 1 of 7 Ash-Cinder cone Destructive Andesitic/Rhyolitic Steep sides a result of a volcanic eruption of ash and lava solidifying along the sides in alternating bands gas filled volcanoes erupt and lava breaks into fragments 2 of 7 Dome Destructive Rhyolitic Steep sloping sides extremely viscous lava builds up around the central vent pyroclastic flow, nuées ardentes 3 of 7 Caldera Destructive Andesitic/Rhyolitic a result of an explosive eruption emptying the magma chamber and blowing off the caldera summit. the sides collapse inwards creating a large crater -Yellowstone National Park, USA 3 calderas formed over 2.1m years, the most recent was 640,000 years ago =Lava Creek lava creek spewedd up 240 cubic miles of ash dust and rock into the air 4 of 7 Shield Constructive Oceanic/Oceanic / Hotspots Basaltic Wide base and gently sloping sides frequent but gentle eruptions -Kilauea, Hawaiian islands. longest period of flow 31/01/83 = 3.5km cubed of lava resurfaced 123.2km cubed of land. 5 of 7 Composite Cone Destructive Oceanic/Construcitve Andesitic/Rhyolitic Alternating bands of ash and lava lots of lapilli, bombs, volatiles very steep sides and extremely tall, secondary vents and fissures -Mt Vesuvius, Campania, Italy 6 of 7 Classification Of Volcanoes Gentle to most explosive Fissure B Hawaiian B Strombolian Thicker B Vulcanian Thicker B, A + R Vesuvian Thicker B, A + R Peléean A + R Plinian R 7 of 7
Comments
No comments have yet been made