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7 Written questions

6 Multiple choice questions

  1. oceanic
  2. solidification of magma or lava
  3. magma
  4. >50% SiO2, gooey, highly viscous, becomes explosive, convergent system associated with continental crust formation.
  5. silicic and mafic
  6. cracks

6 True/False questions

  1. Shield volcanoes due to extensive outpouring of __/basaltic lava with little pyroclastic material.eruptions, lava


  2. Igneous rocks compose __% of basement rock. 85% is metamorphic.Canadian Shield, Rocky Mtns, Appalachian Mtns, Central TX


  3. Stratovolcanoes form by alternating __ of pyroclastic material (ash) and thick __ flows.eruptions, lava


  4. When solidified, magma chamber becomes a __ composed of granite and/or diorite.cracks


  5. Mafic rocks are generated at __ (divergent plate boundaries).ridges


  6. What is extrusive?lava