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VOLCANOES AND PLATE TECTONICS Ch. 3.1, 3.3, 3.4

VOLCANOES AND PLATE TECTONICS Ch. 3.1, 3.3, 3.4. A. Volcanoes. A weak spot in the crust Magma -molten material from mantle comes to the surface. Vocabulary to know…. Magma- molten material made of gases rock-forming substances water silica is the force for magma to erupt Lava-

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VOLCANOES AND PLATE TECTONICS Ch. 3.1, 3.3, 3.4

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  1. VOLCANOES AND PLATE TECTONICSCh. 3.1, 3.3, 3.4

  2. A. Volcanoes • A weakspot in the crust • Magma-molten material from mantle comes to the surface

  3. Vocabulary to know….. • Magma- molten material made of • gases • rock-forming substances • water • silica is the force for magma to erupt • Lava- • Is magma that reaches the surface

  4. B. Ring of Fire • Major volcanicbelt • Formed by many volcanoes around the rim of the PacificOcean • Forms along plateboundaries Volcano 101

  5. C. Volcanoes occur at…. 1. Divergent Boundaries -mid-ocean ridge

  6. 2. SubductionZone -edges of oceans

  7. 3. HotSpots -magma from deep within mantle melts through the crust like a blow torch -Hawaii was formed this way A Pacific Plate drifts over a hot spot to form Hawaii

  8. Label your worksheet.

  9. What is viscosity? • A physicalproperty of a liquid • The resistance of a liquid to flow • The greater the viscosity, the slower the flow • Lava viscosity depends on the silica content and temperature • Pahoehoe: fast moving lava, low viscosity • Aa: slow moving lava, high viscosity

  10. Other vocabulary you should know…. Active volcano -is erupting or will erupt Dormant volcano -sleeping -will awaken in the future, become active Extinct volcano -dead -will not erupt again

  11. Volcanic 4 Landforms Shield volcanoes 1.Many layers of lava 2. Quiet eruptions 3. Gently sloping mountain formed by repeated lava flows 4. 90% is lava flow 5. Lava flows far from the vent 6. Ex. Hawaiian Islands

  12. Cinder Cone Volcanoes 1. piles of cinders form a cone-shaped hill 2. a pyroclastic flow, explosive eruptions, producing ash cinders gases bombs -mass of thick magma 3. the longer the eruption, the higher the cone

  13. Composite volcanoes 1. known as stratovolcanoes 2. tall mountain volcano 3. explosive eruptions 4. alternating layers of ash, cinders, bombs 5. multiple eruptions over hundreds of years 6. occur in chains, mostly in the Ring of Fire 7. Ex. Mount St. Helen’s Mt. Rainier How Volcanoes Form

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