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Section 13-2 Review

Section 13-2 Review. Page #330:1-9. #1. Summarize the difference between mafic and felsic magma. Mafic Magma magnesium & iron dark less viscous. Felsic Magma silica & feldspars light more viscous. #2. Explain how the composition of magma affects the force of volcanic eruptions.

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Section 13-2 Review

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  1. Section 13-2 Review Page #330:1-9

  2. #1 Summarize the difference between mafic and felsic magma. • Mafic Magma • magnesium & iron • dark • less viscous • Felsic Magma • silica & feldspars • light • more viscous

  3. #2 Explain how the composition of magma affects the force of volcanic eruptions. More viscous magma traps gases more easily than less viscous magma, which may lead to more explosive eruptions.

  4. #3 Compare three major types of lava flows. • Pahoehoe – ropy • Aa – jagged • Blocky Lava – large chunks

  5. Pahoehoe

  6. Aa

  7. #4 Define pyroclastic material, and list three examples. Pyroclastic material consists of fragments of rock that form during an explosive eruption.

  8. Pyroclastic Material volcanic bombs volcanic ash/dust lapilli

  9. Volcanic Ash

  10. Bomb

  11. #5 Identify the three main types of volcanic cones. • shield volcano • cinder cones • composite volcano

  12. Types of Volcanoes

  13. Shield Volcano Mauna Loa - Hawaii

  14. Cinder Cone http://video.google.com/videoplay?docid=5804326697533034741&q=cinder+cone+eruption&hl=en

  15. Composite Volcano http://video.google.com/videoplay?docid=3977416382972126736&q=mt+st+helens+eruption&hl=en

  16. #6 Describe how calderas form. A caldera forms when the magma chamber of a volcano empties, causing the volcanic cone to collapse in upon it, or when magma is ejected violently and the cone is destroyed.

  17. Caldera

  18. Crater Lake

  19. #7 List three events that may precede a volcanic eruption. • earthquake activity • rock temperatures increase • volcano area bulges

  20. #8 Why would a sudden increase of earthquake activity around a volcano indicate a possible eruption. Sudden earthquake activity could be caused by magma moving upward through the rock around the volcano.

  21. The End On “Io” a moon of Jupiter

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