Helensmake geologists realize even bigger debris

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Sector collapse at Mount St. Helensmake geologists realize even bigger debris avalanches accurred at other volcanoes such as Mt. Shasta between 300,000-380,000 yrs ago Magma not always involved in triggering sector collapse, sometimes collapse under forve of gravity 12. What are the particles like that are produced by lava fountaining? If you take the same composition of magma but add a bit more gas or make the same magma a bit stickier, what kinds of particles will the volcano produce? Lava fountaining can bubble out of a runny magma as it ascends and not explosive, like water gushing out of a hose - particles produced lack gas bubbles and are aerodynamically shaped If magma is more gas-rich or sticky, the bubbles may not all escape, and will become volcanic cinders - lapilli (pebble) sized pieces of mafic volcanic rock 13. What was done at Lake Nyos to prevent another CO2 gas emission event like the one that killed 1,700 people? How are the CO2 gas emissions at Mammoth different from those of Lake Nyos? Series of huge straws put into place to allow CO2 bubbles to the surface of the Lake Nyos (killed 1,700 pple)in harmless quantities 14. Describe the event that led to the deaths of 15,000 people by a tsunami in Japan in AD 1792.
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Debris avalanche fan generated by AD 1792 collapse on the flank of Unzen volcano, Japan. - debris deposited in the sea and created irregular shoreline fashion and killed 15,000 from resulting tsunami 15. (A) The earth is layered by composition. Make a cross-sectional sketch of the earth that illustrates this layering (core, mantle and crust), and very briefly describe each layer (its density, composition, and relative thickness). (B) The earth is also layered with respect to strength. What is the difference between lithosphere and asthenosphere? What is isostasy? Core: iron-rich (metallic), 9-16X the density of water - Inner is solid, outer is liquid with convection currents (responsible for Earth’s magnetic field Mantle: stony, 6-3X the density of water Crust: stony, less dense than mantle, 2.7-3.2X density of water
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  • Winter '09
  • HELLIER-TINOC
  • Plate Tectonics, Volcano, Pyroclastic flow, Pyroclastic density currents, pyroclastic density

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