ilearn.edu C SAMPLE EXAM #1 - ERTH 310 -FALL 2019 It is highly recommended that you have a printed version of this handout in front of you with your...
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SAMPLE EXAM #1 - ERTH 310 -FALL 2019
It is highly recommended that you have a printed version of this handout in front of you with your best
answers already selected as you take your timed exam. It will help you immensely and is a great study
tool. Once you have opened the exam, the timer starts and you will have only 70 minutes to submit your
answers.
Although this exam is an open notes exam, it is highly recommended that you use only a small index
card to place notes on. This exam is timed and you will not have the luxury of time to look up all your
answers after the exam has started. If you run out of time, you will not be able to go back and re-take the
exam
An answer key will not be posted for this sample exam, nor will I give answers to these questions via
mail. You are expected to work on these questions on your own. However, if you need any
clarification on any of the questions, or you would like to ask me about concepts that don't involve
giving away an exact answer, please feel free to email me anytime with any of those questions.
1. A scientific hypothesis is a method in science where scientists are in the process of trying to prove or disprove a
phenomenon.
a. True
b. False
2. What energy source is Earth using primarily for its internal processes?
a. Ancient asteroid impact
c. Radioactive decay
b. The core
1. The Sun
3. The primary energy source for mantle convection ultimately is:
a. Ancient asteroid impact
c. Radioactive deca
6. The core
1. The Sun
4. The element most abundant in Earth's core is:
a. Calcium
d. Silicon
b. Iron
c. Chlorine
e. Oxygen
5. Choose the best term to fill in the blank: Geology is the_
study of the Earth.
a. Important
.Scientific
b. Climate Change
d. Biological
6. The asthenosphere is defined as a
a. Rocky layer having a relatively uniform
d. Plastic layer composed mainly of mantle
chemical composition.
material.
b. Rigid layer of crustal and mantle material.
e.
Tsunami zone
C.
Rocky layer composed mainly of crustal
rocks.
7. The asthenosphere is located
a. Within the lithosphere
1. Within the outer core
b.
Within the crust
e.
Just above the crust
c. Just below the lithosphere
8. The least dense layer of Earth is the
a. Crust
d. Mantle
b. Inner core
Low velocity zone
c. Outer core
9. Which layer listed below can also be considered a tectonic plate?
a. Asthenosphere
d. Lithosphere
b. Crust
e. Outer core
C.
Mesosphere

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10. The outermost layer of the Earth defined by its composition is called:
a. Lithosphere
d. Outer core
b. Inner Core
e. Crust
c. Asthenosphere
1 1. The layer that sits directly under the outer core is called:
a. Lithosphere
d. Inner core
b. Mantle
Mesosphere
c. Asthenosphere
12. The Earth's tectonic plates are directly propelled by the convection in the_
a. Crust
Asthenosphere
b. Inner core
Mesosphere
c. Outer core
13. The youngest rocks of the seafloor are found at the mid-ocean ridges of the world.
a. True
b. False
14. What type of plate boundary is located at the mid-Atlantic Ridge?
a. Divergent boundary
Transform boundary
b. Convergent boundary
1. There is no plate boundary
15. The Earth's magnetic field helps to drive plate motion.
a. True
b. False
16. Continents are generally older than ocean basins.
a. True
b. False
17. What type of plate boundary does the San Francisco Bay Area sit on?
a. Divergent boundary
Transform boundary
b.
Convergent boundary
d. There is no plate boundary
18. What type of plate boundary are shallow focus earthquakes associated with?
a. Convergent boundary
b. Divergent boundary
c. Transform boundary
d. All boundary types
19. What type of plate boundary is found off the coast of Northernmost California, Oregon and Washington State?
a. Divergent boundary
C. Transform boundary
b. Convergent boundary
d. There is no plate boundary
20. Which feature below is a subduction zone associated with?
a. Flat topography
c. Deep trench
b. Mantle upwelling
d. Mid-ocean ridge
21. Since oceanic crust is constantly being produced, the size of the Earth is increasing in size over time.
a. True
b. False
22. The volcanoes that make up volcanic arcs always sit directly on top of the plate boundary of a subduction zone.
a. True
b. False
23. Oceanic crust is destroyed along
a. Divergent boundaries
c. Transform boundaries
Convergent boundaries
24. Geomagnetic reversals
a. Provide strong evidence for seafloor spreading.
b. Reveal that polar wondering may have occurred.
C.
d.
Were discovered by the Deep Sea Drilling Project
e.
Confirmed the existence of subduction zones.
Cause the movement of the plates.

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25. Crust is neither created nor destroyed at this type of plate boundary.
a. Divergent boundary
c. Transform boundary
b. Convergent boundary
26. The Mariana Trench is the deepest trench in the world. What type of plate boundary creates such a trench?
a. Divergent boundary
c. Transform boundary
b. Convergent boundary
d. All boundary types can create this feature.
27. Ocean trenches:
a. Are caused by divergence at divergent boundaries.
b. Parallel continents and island arc volcanoes.
c. Are created at transform boundaries during an earthquake.
d. Are typically only ~10 meters deep
28. The continents do not get any older than ~200 million years old.
a. True
b. False
29. The distance between a seismological recording station and the earthquake source is determined from the
a.
b.
Calculation of the earthquake magnitude.
Intensity of the earthquake.
c. Length of the seismic record.
d. Arrival times of P and S waves.
e. Measurement of the amplitude of the surface waves.
30. The Richter Magnitude of an earthquake is determined from the:
a. Duration of the earthquake
b. Intensity of the earthquake
. Length of the seismic record.
d.
Arrival time of P and S waves.
e. Measurement of the amplitude of the surface waves.
31. This type of seismic waves travels the slowest.
a. P-waves
d. Tsunami
b. S-waves
Seiches
C.
Surface waves
32. Which of the following is used to describe what occurs to produce an earthquake?
a.
Elastic rebound
Mercalli scale
b. Plastic deformation
Melting
c. Bowen's Reaction Series
33. The quantity of energy released by an earthquake is a measurement referred to as:
a.
Intensity
Magnitude
b. Displacement
e.
c. Stress
34. When an earthquake occurs, energy radiates in all directions from its source. The source is referred to as the:
a.
Inertial point
d. Seismic zone
b.
Wave front
None of the above
c. Focus
35. An earthquake with a magnitude of 6.5 on the Richter scale releases about
times more energy than one
with a magnitude of 5.5.
a. 5
C. 15
e. 45
b. 10
d.
30
36. What is frequently a warning sign of an impending tsunami?
a. Winds suddenly change direction
b. The sky suddenly clears

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. Seawater suddenly retreats from the shoreline.
d. All of the above
37. Powerful tsunami are most frequently produced by
a. Earthquake
d.
Volcanoes
b. Landslide
e.
Asteroid impact
. Hurricane
38. Tsunami can be generated by a hurricane.
a. True
b. False
39. If the seafloor is suddenly displaced vertically, the ocean water will respond by:
a. Subsiding
c. Also moving vertically
b. Not moving at all
40. Calling a tsunami a "tidal wave" is misleading because:
a. A tsunami is not really a tide
C. A tsunami does not occur in the ocean
b. A tsunami is not really a wave
d. A tsunami only occurs during ebb tides
41. The fault motion along the San Andreas fault on the sea floor can directly be the cause of a dangerous tsunami along
the coast of California.
a. True
b. False
42. Which is the most active tsunami area?
a. North Atlantic ocean
C. Caribbean sea
b. Indian ocean
d. Pacific ocean
43. Which of the following rocks below is a felsic extrusive igneous rock?
a. Rhyolit
d.
Andesite
b. Gabbro
e. Diorite
C.
Basalt
44. Gabbro is the most common extrusive igneous rock.
a. True
b. False
45. The rocks that solidify from magma at depth are referred to as extrusive igneous rocks.
a. True
b. False
46. Mount St. Helens is considered to be an:
. Extinct volcano
C. Active volcano
b. Dormant volcano
47. Cinder cones are made up from lava that was:
a. Hot and mafic
. Cold and felsic
b. Cold and mafic
d. Hot and felsic
48. Which volcano type from the choices below can experience a Hawaiian eruption.
Stratovolcano/composite con
Shield volcano
b. Cinder cone
1. All of these
49. Which volcano type can have mafic lava as part of its composition?
a.
Shield volcanoes
1.
All of the above
b.
Cinder cones
Only "a" and "b"
c. Stratovolcanoes/Composite cones
50. Cinder cones are
a. Entirely mafic
C. A mix of mafic and felsic composition
b. Entirely felsic

Top Answer

1.TRUE 2.C (Radioactive decay) 3.C(Radioactive decay) 4.b(Iron) 5.c(Scientific) 6.d(Plastic layer... View the full answer

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