Module 6 - Hazards

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Across
  1. 4. An avalanche of volcanic water and mud down the slopes of a volcano.
  2. 7. The point on the Earth’s surface directly above the focus of an earthquake.
  3. 11. Molten rock beneath the Earth’s surface.
  4. 14. An _____________________ eruption is a type of volcanic eruption in which lava steadily flows out of a volcano onto the ground, the result of magma that is thinner and less viscous.
  5. 15. A ______________________ flow is the rapid movement of ash, cinders, bombs, and gases down the side of a volcano during an explosive eruption.
  6. 16. Process where saturated soil behaves like a liquid during shaking
  7. 18. The Volcanic __________________ Index is a scale that rates a volcano’s destructiveness and explosive power based on the amount of matter it ejects during an eruption.
  8. 20. Hazard that results in significant damage to life and property
  9. 22. Instrument used to measure horizontal or vertical motion during an earthquake.
  10. 24. Visual record produced by a seismometer
  11. 25. The point beneath Earth’s surface where rock breaks under stress and causes an earthquake.
Down
  1. 1. A ______________________ boundary is where two plates move toward each other.
  2. 2. Technology used to alert populations to an impending hazard
  3. 3. An instrument used for measuring the angle or elevation of slopes.
  4. 5. An __________ cloud is a dense cloud of powdered hot rock.
  5. 6. ___________________ volcanism is volcanic activity associated with subduction zones, where subducted crust is melted and mixed with silicate minerals.
  6. 8. Strategies used to reduce the impact of natural hazards
  7. 9. Extremely deep areas in the ocean that are created by a subducting plate.
  8. 10. An _____________________ eruption is a violent and unpredictable eruption, the result of magma that is thicker and more viscous.
  9. 12. Molten rock on Earth’s surface.
  10. 13. Natural process with the potential to cause harm
  11. 17. A liquid’s resistance to flow.
  12. 19. A giant wave usually caused by an earthquake beneath the ocean floor.
  13. 21. The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary.
  14. 23. ARC A string of volcanoes that form as the result of subduction of one oceanic plate beneath a second oceanic plate.