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1) TYPES OF VOLCANOES 2) WHAT IS MAGMA MADE OF? Composition (What something is made of) Determined by the where it is formed “geologic setting” Determines what it is made from Mixture of SiO2, Fe, Mg and other elements. Amount of SiO2 in the magma determines: Type Viscosity Gas release ability Why is it called lava??? I thought it was magma… Lava Mafic-Dark Intermediate Felsic-Light Rock Type Basalt Andesite Rhyolite SiO2% 45-50 50-60 60+ Viscosity Low Medium High Temperature Lower-700 C Medium Higher-1600 C What kind of rocks form? Shield Volcanoes Broader Not explosive Constant gas release Why do you think it is not explosive (hmm)? High Viscosity Flows really well so you get broad short volcano Cinder Cones Steep More explosive Gases trapped Viscosity What do you think… Higher Shield? or lower than Stratovolcanoes Steepest large and explosive Symmetric Gases trapped Tallest At subduction zones Mt. Fuji, Japan Mt. Pinatubo, Philippines Mt. Rainier, Washington Viscosity? Guess What?! Attention Check Time 1) If you want to make yourself a Hawaiian Shield Volcano at home what would be a good substitute for the viscosity of magma that it has? A) Syrup B) Water C) Molasses D) there shouldn’t be any magma 2) Which volcanoes are the most explosive? 3) Why are they so explosive (what are 2 things they have in common)? 4) Can you think of a way to make a volcano more explosive?