Exam 1 KEY - EARTHSS 7 MIDTERM 1 WINTER 2016 NAME W STUDENT...

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Unformatted text preview: EARTHSS 7 MIDTERM 1 WINTER 2016 NAME: W STUDENT ID: MIDTERM #1 PART I: MULTIPLE CHOICE. 1 best answer for each question, worth 1 point each. 1. Differentiation of the core from the mantle in early Earth’s history was possible because: a. The Earth was small and light as) The Earth was molten c. The oceans had not yet formed (:1. The mantle was more dense than the core 2. Which of the following is true about intermediate magma types? a. They rarely result in explosive volcanoes b. They are more viscous than felsic magmas . They are hotter than mafic magmas They have less silica than Felsic magmas 3. About how far away is the nearest star to Earth? . 4.6 billion years 4 light years ‘ I @030 c. 10 trillion km 2 CD 150 million km 4. The image to the right shows a: a. Pluton c. Dike 'Xenolith e. None of the above 5. Using the same image as the question above, we know that which process most likely happened? a. Partial melting @ Assimilation c. Fractional Crystallization d. Magma Melting e. None of the above EARTHSS 7 MIDTERM 1 WINTER 2016 6. Which ofthe following is true about silicate minerals? a The silica tetrahedral do not often link together to share oxygens b. The more silicon there is in a mineral, the more viscous the magma becomes c. If silica tetrahedral share all of their oxygens, they become a 2-dimensional structure d. Silicate minerals are some of the rarest on Earth. 7. Calculate the volume ofa substance with a mass of 22g and a density of 4g/cm3 a. 0.18cm3 31 ..-.18cm3 ii _ p 3 5.5cm3 L} '5 : 5'JQ’PA d. 4.5cm3 3/6““ 8. A divergent boundary in the middle of the Atlantic is likely to result in what type of intrusive rock? W a. Granite b. Andesite \ (<3) Gabbro «— \oli‘mml‘C d. Basalt w- {:‘M‘MSN‘C 9. We know that our solar system is at least a 3rd generation star because: The planets are partially formed from heavy elements, like iron (Fe). b. This is an untrue statement. Our star is likely the age of the Universe, 13.7 billion years. c. The universe is expanding d, Medium-sized stars (like our sun] only retain planets if they are 211d generation stars [or more]. 10. How many tectonic plates are represented by this ocean profile? a. 2 GD?» c. 4 d. 5 EARTHSS 7 MIDTERM 1 WINTER 2016 11. All ofthe following are true about Earth‘s magnetic field EXCEPT a. Sometimes, the field can flip, whereby south becomes north and north becomes south b. Relative to the continents, the poles remain in place and do not “wander" c. The mineral magnetite in rocks aligns with the magnetic field (1. Declination and inclination of magnetite are used to determine the location of .. rock formation (Nate/f @The magnetic field originates from Earth’s liquid infir c075" 12. Some volcanoes produce rapidly flowing lava, and some produce explosive eruptions with no lava. The viscosity of the lava is controlled mainly by: -. The amount ofgas in the lava ‘The amount of silica in the lava c. The amount ofwater in the lava d. The pressure 13. Which of the following is true about glass? a. The mineral crystals are so small that they give the rock a glassy sheen b. Glass is not a type ofrock 65? Glass forms from extrusive magmas . Glass is not a large component of pyroclastic material 14. True or False: If allowed to grow unobstructed, the "crystal lattice" of a mineral will co ol its ultimate crystal structure - a. True . False 15. In the followmg diagram of magnetic Plate 1 Plate 2 reversals, Wthh oceanlc plate 15 moving faster? a. Impossible to tell with the information given a Plate 1 c. Plate 2 d. They are both moving at the same speed Spreading center 16. Hot spots [like the Hawaiian islands] often cause island chains. With a hot spot, what is actually moving? ,a The mantle plume b The oceanic plate above the mantle plume c. The asthenosphere below the oceanic plate d. None ofthe above EARTHSS 7 MIDTERM 1 WINTER 2016 17. In at tectonic environments are plutons likely to form? Subduction Zones #7 W \Le, hog-()- (lama a. Mid Oceanic Ridges , c. Transform boundaries d. Any divergent boundary e. Any plate boundary that involves igneous rock 18. Which of the following is FALSE about fractional crystallization? a. Fractional crystallization increases the amount of silica present in magma over time ‘T Ga) Heavier minerals, such as iron and magnesium, usually crystallize LAST F c. Fractional crystallization can change an ultramafic magma into an andesitic magma in a subduction zone, like the Andes mountains. "T" d. Fractional crystallization explains why oceanic convergent boundaries don't always result in basaltic lavas. T' 19. Which of the following is true about continental margins? a. A tectonically passive continental margin is associated with a narrow continental shelf An oceanic trench usually is associated with active margins c. A active margin will have few earthquakes d. A passive margin is associated with a subduction zone 20. If a continental plate is converging With an oceanic plate, what type of lava is likely to form? a. Rhyolite , \ ‘0. Granite ~27 \O‘WUSNO VOCAL - c. Andesite d. A and /or B A and/or C 21. Which of the following is FALSE about sea floor spreading in the Atlantic? ' a. The oldest rock is closest to the continents b The youngest rock is the least dense ‘ '~ .. The lava flowing from the spreading center is likely andesitic "9 M h L . The density of the crust increases as the rock moves away from the spreading center e. The Mid Atlantic ridge is the longest mountain chain in the world 22. Mineral polymorphs are: a. Minerals with different chemical compositions b. Minerals with the same crystalline structure \ GD Minerals with the same chemical composition but different structures 4? Lil/‘6’ d. A and B ClIaMCII EARTHSS 7 MIDTERM 1 WINTER 2016 23. Use the graph to answer the questions that follow. a. First, label the axes [2) b. What do we call the type of melting described by the dashed line? (1] (glcCOMQQSeim “muons, ”release. in (9erng (6 c. What type of tectonic plate boundary is this type of melting generally associated with? [1] rlfi‘njl Mid “Ceca/h f‘léljflgj Spa—Gd"? Calif/VS) hbl 59013 d. Describe something else you could do to melt at rock at point A without increasing heat. [1] OkCld Mia/W l u o la e. Draw a new solidus line on the graph to represent the type of melting you d 'b d' P tD. 1 e m a“ U awed edha/ m awed 3f \ flag, Waugh” lit/Lb EARTHSS 7 MIDTERM 1 WINTER 2016 24. The top box below is an aerial View ofthe ocean (think ofthe box being colored in by blue). The solid grey line represents an oceanic trench. The triangles represent a volcanic island arc. You will be focusing on transect line A-B [dashed line]. The bottom box is an empty profile View of transect line A-B. 3- first What type of plate boundary is this? Be specific. (1] ’Occfcum c: ocean U12 Cmvefgflfll" bOOncl CVL/ b. in the box provided below the ocean map, draw a profile view of the two plates. (The dashed line in this case represents sea level] On your profile, label the two plates, the mantle, the trench, and the volcano. [4-] c. Draw arrows on your diagram showing which way the plates are moving. [1] d. Label the plate that is more dense. How do you know? (2] W lined PWC ‘lll 15 MW”: 6161756 beawsfl 3+ 15 subduchwj bencallx pubic #2 EARTHSS 7 MIDTERM 1 WINTER 2016 25. Planet E837 is a planet very similar to our Earth. Like Earth, the crust is comprised ofeither granite or basalt. a. The density of 5% t and; is 2.7 g/cm3, and the density of Mad i: is 3.0 g/cm3. (2) b. The main difference is that on Planet ESS7, the average crustal thickness of basalt is 12km, while the average crustal thickness of granite is 45km. The density of the mantle is 3.3 g/cm3. Calculate the average height of basalt above the mantle. [2] ”[1<D%\\\{ BASAJA’ ”above "' joy 0"“ 3) l2 PM 3 53/0m3 HabWL: \loq Y—M iul We Habove H 0b \edi‘ c. Calculate the average height of granite above the mantle. (2) dorm Extra credit: Name a famous pluton Half" D0 M94! ...
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