Name _______________________________________ Period _____________ Unit 4 Lesson 4 –Volcano Test Review (86) Things to know for the test: What is created near a volcanoes vent? Types of volcanic eruptions and relationship to viscosity Types of volcanoes and the viscosity (silica content) of the magma/lava How amount of gases and temperature affect viscosity of lava. What is a hot spot? An example The difference between pyroclastic material and lava. The three types of pyroclastic materials and their relative sizes Difference between aa and pahoehoe and the viscosity of lava The process that causes hot, solid rock to rise through the mantle The 3 levels of volcanoes Ring of fire Volcanoes and convergent and divergent tectonic boundaries Difference between crater and caldera Parts of a volcano Formation of a volcano What determines how magma will flow? What force causes magma to erupt to the surface?