Two main types of volcano

SHIELD Volcano COMPOSITE/STRATO Volcano

Plate margin Constructive plate margin Destructive plate marginMagma Basaltic lava of low viscosity Acidic

Lava

characteristics Thin runny lava, low silica Vicious, high silica

Violence of

eruption Gentle – gases escape easily Potentially explosive, lava shatters

Materials

erupted Mainly lava Hot steam, ash, rock, lava bomb and dust

Frequency of

eruption Regular and frequent eruption Irregular (occasional) and violent eruption, long dormant period

Example The Hawaiian Islands Mount Fuji, Japan; Mount Ranier,