Homework answers / question archive / McMaster University EARTH SC 2gg3 Quiz 2 1)The most dangerous area during the pyroclastic flow is: The top of the mountain The air above the mountain The bottom of the valley The mountain   What kind of material is most likely to fall in a rotational slide? Homogeneous, cohesive material Rounded sand grains in the slope Loose, dry soils Elongated boulders with smoothly rounded sides   The name of acidic volcanic smog is: Pumice Lahar Carbon dioxide Vog   What is daylighted surface or layer? A weak layer, sloping downward toward a road cut or hillside at a somewhat gentler slope than the hillside A part of the bedrock that is exposed at the surface   A layer that becomes exposed by excavation of a road cut None of theses   Rhyolite magma typically erupts in what form? Thin, fast-moving lava flows Thick, fast-moving lava flows Lahars Fine ash   Which of the following statements about volatiles is true? Magmas that contain little water erupt violently Water exposed to high temperatures of magma become a solid Water content determines the violence of a volcanic eruption All of these are true   What is a volcanic surge? An underground magma flow A mixture of hot volcanic ash, water and steam that rushes down the volcano’s slope A high speed, violent ash-rich shock wave A tremendous earthquake   What is the term describing the process of gases coming out of solution, when the pressure drops and magma rises? a) Expire Express Exsolve None of these   Volcanic mudflows, or lahars are caused when which of the following combine? Lava and rocks Ash and lava Water and ash Lava and water   Which of the two main volcanic gases is heavier than air, collects in low areas and can asphyxiate people or animals if it is in high concentrations? a) Hydrogen Water vapor Ethane Carbon dioxide   If you see a large volcano with very gentle slopes, what kind of volcano is it and what rock is it likely to be made of? a) A stratovolcano made of andesite A cinder cone made of basalt A shield volcano made of basalt lava flows A stratovolcano made of basalt lava flows   Where are quick clays most common? Alaska, Canada, Scandinavia Central America and Africa California Colorado and Wyoming   What type of volcano consists of layers of lava, fragmental debris and ash? Shield volcano Cinder cone Stratovolcano Continental caldera   Old landslides are NOT normally reactivated by                                       

McMaster University EARTH SC 2gg3 Quiz 2 1)The most dangerous area during the pyroclastic flow is: The top of the mountain The air above the mountain The bottom of the valley The mountain   What kind of material is most likely to fall in a rotational slide? Homogeneous, cohesive material Rounded sand grains in the slope Loose, dry soils Elongated boulders with smoothly rounded sides   The name of acidic volcanic smog is: Pumice Lahar Carbon dioxide Vog   What is daylighted surface or layer? A weak layer, sloping downward toward a road cut or hillside at a somewhat gentler slope than the hillside A part of the bedrock that is exposed at the surface   A layer that becomes exposed by excavation of a road cut None of theses   Rhyolite magma typically erupts in what form? Thin, fast-moving lava flows Thick, fast-moving lava flows Lahars Fine ash   Which of the following statements about volatiles is true? Magmas that contain little water erupt violently Water exposed to high temperatures of magma become a solid Water content determines the violence of a volcanic eruption All of these are true   What is a volcanic surge? An underground magma flow A mixture of hot volcanic ash, water and steam that rushes down the volcano’s slope A high speed, violent ash-rich shock wave A tremendous earthquake   What is the term describing the process of gases coming out of solution, when the pressure drops and magma rises? a) Expire Express Exsolve None of these   Volcanic mudflows, or lahars are caused when which of the following combine? Lava and rocks Ash and lava Water and ash Lava and water   Which of the two main volcanic gases is heavier than air, collects in low areas and can asphyxiate people or animals if it is in high concentrations? a) Hydrogen Water vapor Ethane Carbon dioxide   If you see a large volcano with very gentle slopes, what kind of volcano is it and what rock is it likely to be made of? a) A stratovolcano made of andesite A cinder cone made of basalt A shield volcano made of basalt lava flows A stratovolcano made of basalt lava flows   Where are quick clays most common? Alaska, Canada, Scandinavia Central America and Africa California Colorado and Wyoming   What type of volcano consists of layers of lava, fragmental debris and ash? Shield volcano Cinder cone Stratovolcano Continental caldera   Old landslides are NOT normally reactivated by                                       

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4. Place a load on the slope to squeeze water out of it

 

18. For a rockfall or debris avalanche, what two factors lead to a greater distance of travel of the moving debris?

1. Greater size of the falling mass and smaller particles
2. Greater eight of the fall of the mass and greater volume of the falling mass
3. More water in the mass and release promoted by freezing
4. Higher clay content and smaller particles

 

19. What is “cohesion” as applied to slope failure?

1. The condition of a slope that has not yet begun to slide
2. The holding together of otherwise loose grains on a slope, often by a little moisture
3. Loose grains in a slope that are angular rather than rounded so they don’t slip past one another easily
4. None of these

 

20. What is tuff?

1. Broken and hardened magma
2. Lava hardens from ash flow
3. Ash after deposition forms a rock
4. None of these