4 what are the two types of lahars and what are their

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4. What are the two types of lahars and what are their characteristics? (page 146, para 2 to page 147) Cohesive debris flows which contain more than 3-5% clay-wet concrete Non-cohesive debri flows contain smaller amount of clay- begins as a flood 5. What type of lahar occurred at Mt. St. Helens and how did it get created? (page 147, para 1) A large lahar was of the cohesive variety at Mt. St. Helens and it was created by water and mud that was derived from compaction and melting of ice and the huge debris avalanche. 6. What type of lahar occurred at Columbia’s Nevado del Ruiz Volcano? (page 147, para 1) The lahar that occurred at Nevado de Ruiz volcano was a noncohesive 7. What was the Osceola Mudflow? (page 147, para 1) The Osceola Mudflow was an enormous, 3 cubic km flow of mud from Mt Rainer that reached Puget Sound 5700 years ago 8. What is a "jokulhlaups"? (page 148, para 1 to page 147, para 3) Increasing pressure from a reservoirs rising level eventually forces the water to move beneath the ice cap and escape through one of the rive valleys that drain the glacier. These huge flood are called jokulhlaups which means “glacial bursts.” 9. What is an avalanche? (page 148, para 4) An avalanche is a large mass of snow, ice, soil or rock, or mixture of these materials that falls or slides rapidly down a cliff or steep slope.
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10. How big in cubic kilometers are the largest submarine debris avalanches? (page 150,
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  • Fall '08
  • Campbell-mccrea,M
  • Volcano, lahar, Nevado del Ruiz, Nevado de Ruiz volcano

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