Volcanoes

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Volcanoes

  1. 1. 1. The minimum number of seismograph stations necessary to determine the location of an earthquake is . 2. Which point below is the focus of the earthquake? 3. Which point below is the epicenter of the earthquake? A B 3 B A
  2. 2. ReviewReview • P-waves • S-waves • L-waves • Epicenter • Focus • Trilateration
  3. 3. VolcanoesVolcanoes Any opening in the Earth’s crust through which magma reaches the surface The openings are called vents
  4. 4. VolcanoesVolcanoes When magma reaches the surface it is called lava Hills or mountains are a result of this process
  5. 5. VolcanoesVolcanoes •3 types of volcanoes
  6. 6. Shield VolcanoesShield Volcanoes Broad and rounded Made from stacks of runny basaltic lava
  7. 7. Mauna Loa, Hawaii
  8. 8. Kilimanjaro, Africa
  9. 9. Cinder ConeCinder Cone Smallest, most abundant Violent eruptions with lots of ash Active for short time, then become dormant
  10. 10. Paricutin, MexicoParicutin, Mexico
  11. 11. Composite ConeComposite Cone Steep sided volcano made of alternating layers of cinders and lava Usually found along plate boundaries
  12. 12. Mount Fuji, JapanMount Fuji, Japan
  13. 13. OccurrencesOccurrences Most volcanoes occur at or near subduction zones
  14. 14. Arenal Volcano, Costa RicaArenal Volcano, Costa Rica
  15. 15. OccurrencesOccurrences Some occur near divergent plate boundaries
  16. 16. IcelandIceland
  17. 17. OccurrencesOccurrences Some occur in the middle of plates Hot spot volcanoes
  18. 18. Mauna Loa, Hawaii
  19. 19. Kilimanjaro, Africa
  20. 20. EruptionsEruptions •Different types of eruptions
  21. 21. Explosive Quiet
  22. 22. Different types of LavaDifferent types of Lava Aa Lava
  23. 23. Pahoehoe LavaPahoehoe Lava
  24. 24. Skylight
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