2. Tom Abbott, Biddulph High School and made available through www.sln.org.uk/geography and only for non commercial use in schools Composite Cone The volcano is built up of alternate layers of LAVA and ASH. They can explode with great violence. Mt St Helens - USA Conelet Dyke Crater Ash layer Lava Layer Flank eruption Lava Flow Crust Pyroclastic Flow
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4. Shield ( Basic) Cone Shield Volcanoes are enormous features built up only from layers of lava. They produce lots of lava but they tend not to erupt violently. Mauna Loa Hawaii -USA 250 miles 10,000m Composite volcano to scale Layers of Lava Lava Flow
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6. Differences between composite and shield explosive, Mauna Loa, narrow and steep, basaltic lava, destructive, wide and gentle slopes, non-violent, constructive, silica lava, Mt St Helens Composite Shield
7. Differences between composite and shield explosive, Mauna Loa, narrow and steep, basaltic lava, destructive, wide and gentle slopes, non-violent, constructive, silica lava, Mt St Helens basalt rhyolite rock Little ash, lots of runny lava Lots of ash Frequent eruptions Less frequent eruptions Wide base Narrow base gentle Steep sided Basic lava (runny) Acid lava (thick and sticky) Constructive plate boundaries Destructive plate boundaries effusive Explosive Composite Shield
