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10 True/False questions

  1. What is the Ring of Fire? Where is it?Ash and pumice fragments propelled from vents at a high speed, typically felsic magma.

          

  2. 2. Why do some volcanoes erupt violently while others erupt "gently"?A mudlike volcanic debris flow. Rain or melting snow can lead to lahars.

          

  3. 1. What factors affect the viscosity of magmas?Ash and pumice fragments propelled from vents at a high speed, typically felsic magma.

          

  4. 8. Be able to describe the basic steps in the eruption of Mt. Saint Helens. (in-class video).Lava can be Pahoehoe which is hotter and more fluid (Hawaii) or Aa which resemble jagged blocks which are cooler and thicker with bubbles formed inside by the gasses. The gasses are generally water vapor and carbon dioxide. Pyroclastic materials such as ash, dust, pumice, walnut sized lapilli and pea sized cinders are also released during an eruption.

          

  5. 9. Describe how and where (the type of plate boundary or plate location and the process) the following types of volcanic landforms occur and give an example for each (Name a place). (You can draw a picture as part of your answer if you like.)
    1. volcanic island arcs
    2. continental volcanic arcs
    3. continental rift volcanoes
    A mudlike volcanic debris flow. Rain or melting snow can lead to lahars.

          

  6. 5. What is a lahar? What two types sources of water can lead to lahars?Temperature (hotter is less viscous). Coposition. High silica is felsic/high viscosity.

          

  7. 4. Contrast a shield volcano and a stratovolcano. You can use a picture as part of your explanation. Explain how they are different. Give an example of each.A shield volcano is large and gradually sloping. It is broad with a slight dome. They produce basaltic lava and can be found in places such as Hawaii. Stratovolcanoes such as Mt. St. Helens are large in size. They are very violent and produce a large pyroclastic flow upon eruption. They are generally much steeper than shield volcanos.

          

  8. 6. What is a caldera? How does it form? What are the three types of calderas?A mudlike volcanic debris flow. Rain or melting snow can lead to lahars.

          

  9. 7. What is a pyroclastic flow?The ring of fire is an area in the pacific ocean with a large amount of geographic activity. This results in volcanoes, earthquakes and tsunamis.

          

  10. 3. Name and briefly describe the materials extruded during an eruption. (lava, gases and pyroclastic materials) (see pp. 160-163)1. The northern mountain collapsed and created a landslide.
    2. A blast came out of the collapsed area and along with the landslide destroyed the environment.
    3. The landslide then met with nearby lakes to create a dam and formed a lahar that further destroyed the environment.
    4. Ash from the volcano clouded the sky and disrupted weather around the planet.