Student Questions on Chapter 4

Place your practice question for Chapter 4 in this exam. You can write a multiple choice, matching, or essay question. Be sure your question is original. Remember to put your name in parentheses at the end of the question field.

  1. Why types of rocks are under aphanitic? (Jenna Von Fange)
    granite
    diorite
    dacite
    rhyolite
    both c & d

  2. What is the typical velocity of a pyroclastic lava flow.(David Sahli)
    100 kilometers per hour
    150 kilometers per hour
    200 kilometers per hour
    250 kilometers per hour

  3. What is the difference between lava and magma? (Aranda Geiger)

  4. What is the circular or elliptical depression at Earth's surface formed when a significant volume of magma is removed from a shallow magma chamber without immediate replenishment from deeper levels, causing the roof of the chamber to collapse? (Megan Palsma)
    obsidian
    pyroclastic-fall deposits
    batholiths
    lava domes
    caldera

  5. What is the difference between Composition and Twxture of a rock? (Andrew Hurt)
    Composition is what the rock is made of, texture is the sizes of the crystals on the rock.
    Compostion is the hardness of the rock, texture is the color.
    Compostion is the shape of the rock, texture is the look of it.

  6. The Earth's oceanic crust is mainly composed of what mafic, aphanitic, and phaneritic minerals? (Emma Fikkert)
    Peridotite
    Rhyolite and Granite
    Basalt and Gabbro
    Andesite and Diorite

  7. What is the first component in classifing rocks? (Erika Carlson)
    Magma Flow
    Texture
    Content
    Texture+Composition
    Composition

  8. Igneous rock is mostly from what mineral group? (Michelle Kronberg)
    Silcates
    Oxides
    Sulfates
    Carbonates
    Sulfides

  9. The igneous rock peridotite composes Earth's mantle. What is peridotite's composition and texture? (Chris Moen)
    Felsic and phaneritic
    Mafic and aphanitic
    Intermediate and aphanitic
    Ultramafic and phaneritic

  10. At which silica weight % is Plagioclase Feldspar most sodium rich? (Jeff Langeland)
    45%
    80%
    55%
    65%
    95%

  11. What are the four differnt types of compositions? (Christina Chau)
    Felsic,Intermediate,Mafic and Ulturmatic
    Felisic,Intermediate,Mafic and Solid
    Felisic,Intermediate,Mafic, and Ultrumatric
    None of the Above

  12. Porphyritic texture consists of what? (Karen Faber)
    course-grain texture
    very small crystals
    fine and course crystal

  13. Viscosity and gas content decrease with increasing silica content. (Darla Brandt)
    True
    False

  14. Which type of volcano ranges from 300m to 10,000m high and is composed of many thin and widespread basaltic lava flows, and is active for centuries to a few million years? (Meghan Peterson)
    dome complexes
    shield volcano
    composite volcano
    cinder cone

  15. Aphanitic texture is known as the fast cooling crystallization that occurs in .. (Bridgette Olinger)
    fine-grained textures
    course-grain textures
    mixed grain textures (fine and course textures)
    glassy textures

  16. Why do pyroclastic flows commonly cause such great amounts of damage? (Jennifer Jensen)
    They are hotter.
    They are fast-moving.
    They explode higher.
    They create more ash.

  17. What is the difference between Aphanitic and Phaneritic rock textures? (Bobbi Jo McIntire)

  18. The first minerals to crystallize are? (Becky Haslam)
    The First to melt
    Melt somewhere in the middle
    The last to melt
    None of the above

  19. Which of the following is a type of Felsic Rock? (Jen Coffey)
    Andesite
    Gabbro
    Komatite
    Rhyolite
    None of the Above

  20. In some cases, magma rises to form long, steep, tabular _____ along fractures in the surrounding rocks.(michelle zentmire)
    sills
    stocks
    dikes

  21. What type of igneous rock is fine-grained, cools fast leading to small crystals, and is usually volcanic/extrusive? (Lacey Messerschmidt)
    Phaneritic
    Aphanitic

  22. What type of texture consists of a mixture of fine and course crystal sizes?(Jessica Kerher)
    obsidian
    aphanitic
    porphyritic
    phaneritic
    lapilli

  23. What is an extreme case where lava seemingly does not flow at all but merely squeezes out as large moundsdirectly over the volcanic vent?(Jenna Johnson)
    pyroclastic-fall deposits
    pyroclastic-flow deposits
    lava domes
    welded tuff
    volcanic neck

  24. What type of lava is so fluid that it can form lava lakes, fountains, rivers, and caves? (Jason Von Eschen)
    Felsic Lava
    Basaltic Lava
    Andesite Lava
    Viscous Lava

  25. Which of the following is not a composistion on igneous rocks? (Kayla Armstrong)
    felsic
    mafic
    advanced
    intermediate
    ultramafic

  26. Which of these is the largest fragments that fall after a volcanic eruption?(Jesse Dunklau)
    bombs
    ash
    missles
    lapilli
    welded lapilli

  27. Match the following types of volcanoes with the proper composition: (Sara Ashley Anderson)
    Types of Volcanoes Composition
    Shield Volcanoes
    Cinder Cones
    Composite Volcanoes
    Dome Complexes     		Dacitic, Andesitic, and Basaltic
    Rhyolitic and Dactic
    Andesitic and Basaltic
    Basaltic

  28. What is Pumice mined for? (Nathan Selken)
    Tooth Paste
    Glue
    Foam
    Hair Moose

  29. What type of Igneous Rock texture is caused by fast cooling magma, usually volcanic/extrusive? (Marissa Beene)
    Phaneritic
    Porphyritic
    Aphanitic
    Glassy

  30. What are sills? (Callie Ware)
    Large bodies of intrusive rocks
    Steep inclined intrusions that cut across sedimentary layers
    Horizontal intrusions that are parrallel to sedimentary layers.

  31. What kind of vlocanoes have Basalt as its composition?(Christine Rodriguez)
    Cinder Volcanoes
    Dome Volcanoes
    Shield Volcanoes
    Composite Volcanoes

  32. The two forms of classification are what? (Marty Schoenleber)
    Color and Size
    Composition and Texture
    Weight and Texture
    Color and Composition
    Size and Texture

  33. What are the two classifications of Lava? (Mia Pruefer)
    Pahaha and O'o
    Smooth and Ropy
    Rough and difficult to walk on
    Pahoehoe and A'a

  34. How does the Bowen's reaction series end? (Kayla Carstens)
    Olivine
    Quartz
    Biotite Mica
    Ca-Plagioclase
    Orthoclase (K-spar)

  35. What is the most abundant magmatic gas? (Becca Miller)
    Carbon
    Natural gas
    Water vapor
    Silicic acid

  36. Where is Mount St. Helens located? (Ashley Augspurger)
    Oregon
    Iceland
    Japan
    Hawaii
    Washington

  37. The first minerals to crystalize are those that are : (Julie Wagner)
    Last to melt
    First to melt
    Quickest to cool

  38. Which type of valcanoe is very large and basaltic? (Staci Smith)
    Shield
    Dome
    Composite
    Cinder cone

  39. Mount Fuji is an example of what kind of volcano? (adriana spading)
    Cinder cone
    Shield
    Composite
    Dome

  40. __________ is felsic volcanic glass with dark gray to black color that seems uncharacteristic of felsic rocks. (Erin Wibben)
    aphantic
    porphyritic
    phaneritic
    obsidian

  41. Which key compositional characteristics commonly contain hornblende, biotite, or pyroxene, and plagioclase feldspar with nearly equal amounts of calcium and sodium? (Angela Degen)
    Mafic
    Ultramafic
    intermediate
    felsic

  42. An eruption with a relatively high silica content and low eruption temperature would most likely form this type of volcano: (Jordan McQuillen)
    Cinder
    Dome
    Cryovolcano
    Composite
    Shield

  43. Variations in ____, ____, and ____ determine melting conditions for different original rock compositions. (Traci Ellis)
    elevation, temperature, water content
    size, shape, pressure
    temperature, pressure, water content
    temperature, amount, pressure
    temperature, atoms, ions

  44. What type of volcano composition is the most explosive? (Josh Kohn)
    Andesitic
    Basaltic
    Rhyolitic
    Dacitic

  45. the relationship of increasing temperature as a function of depth is known as what? (Nick Datzov)
    inverse correlation
    magma index
    scaling index
    magma gradient
    geothermal gradient

  46. ____ are an extreme case where lava seemingly does not flow at all but merely squeezes out as large mounds directly over the volcanic vent. (Robert Fisher)
    pyroclastic-fall deposits
    lava domes
    welded tuff
    volcanoes

  47. Basaltic lava is so fluid that it forms all the following EXCEPT: (amanda benak)
    lava rivers
    lava tube caves
    lava islands
    lava fountains

  48. Porphyritic rocks have a texture made of... (Emily Bolon)
    fine and course crystals
    fine crystals
    coarse crystals
    none of the above

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