Understanding Earth Seventh Edition Test Bank

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Chapter: Chapter 1: The Earth System
Multiple Choice
1. Living organisms have been on Earth for _________ of Earth's history.
A) less than 1%
B) approximately 20%
C) approximately 50%
D) approximately 80%
Ans: D
Section: 1-6: An Overview of Geologic Time
2. Which of the following statements regarding the scientific method is true?
A) A hypothesis must be agreed upon by more than one scientist.
B) A theory is a hypothesis that has withstood many scientific tests.
C) A theory is proven to be true and therefore may not be discarded.
D) A hypothesis cannot predict the outcome of scientific experiments.
Ans: B
Section: 1-1: The Scientific Method
3. Which of the following statements about the scientific method is false?
A) A scientific theory is never considered finally proved.

B) Data used to generate a hypothesis may come from observations, experiments, and
chance findings.
C) A theory that has accumulated a substantial body of experimental support is called a
hypothesis.
D) A scientific model represents some aspect of nature based on a set of hypotheses and
theories.
Ans: C
Section: 1-1: The Scientific Method
4. According to the principle of uniformitarianism,
A) geologic processes we observe today have operated in the past.
B) animals evolved at a uniform rate.
C) all of the planets formed from a uniform solar nebula.
D) early Earth was covered by a uniform magma ocean.
Ans: A
Section: 1-3: The Geologic Record
5. How old is Earth?
A) approximately 4.5 thousand years
B) approximately 4.5 billion years
C) approximately 4.5 million years
D) approximately 4.5 trillion years
Ans: B
Section: 1-6: An Overview of Geologic Time
6. Earth's core is made up primarily of
A) iron.
B) lead.
C) oxygen.
D) silicon.
Ans: A
Section: 1-4: Peeling the Onion: Discovery of a Layered Earth

7. Which of the following elements is more abundant in Earth's crust than in Earth as a
whole?
A) iron
B) magnesium
C) nickel
D) silicon
Ans: D
Section: 1-4: Peeling the Onion: Discovery of a Layered Earth
8. Which of the following makes up the bulk of Earth?
A) crust
B) inner core
C) mantle
D) outer core
Ans: C
Section: 1-4: Peeling the Onion: Discovery of a Layered Earth
9. Ninety percent of Earth is made up of which four elements?
A) iron, oxygen, silicon, and magnesium
B) oxygen, nitrogen, hydrogen, and silicon
C) magnesium, aluminum, silicon, and oxygen
D) silicon, calcium, aluminum, and iron
Ans: A
Section: 1-4: Peeling the Onion: Discovery of a Layered Earth
10. Approximately 50% of Earth's crust is made up of which element?
A) aluminum
B) iron
C) oxygen
D) silicon

Ans: C
Section: 1-4: Peeling the Onion: Discovery of a Layered Earth
11. Earth exchanges __________ with the rest of the cosmos.
A) energy and mass
B) mass, but not energy,
C) energy, but not mass,
D) neither energy nor mass
Ans: A
Section: 1-5: Earth as a System of Interacting Components
12. Solar energy energizes all of the following major components of Earth system,
except the
A) atmosphere.
B) biosphere.
C) hydrosphere.
D) lithosphere.
Ans: D
Section: 1-5: Earth as a System of Interacting Components
13. What powers Earth's external heat engine?
A) gravitational energy
B) radioactive decay
C) solar energy
D) tidal forces
Ans: C
Section: 1-5: Earth as a System of Interacting Components
14. In which of the following subsystems is Earth's magnetic field generated?
A) climate system

B) hydrologic system
C) geodynamo system
D) plate tectonic system
Ans: C
Section: 1-5: Earth as a System of Interacting Components
15. Earth's climate system involves interactions between the atmosphere and the
A) biosphere.
B) hydrosphere.
C) lithosphere.
D) biosphere, hydrosphere, and lithosphere.
Ans: D
Section: 1-5: Earth as a System of Interacting Components
16. On average, Earth's lithosphere is approximately ____ km thick.
A) 4
B) 20
C) 100
D) 500
Ans: C
Section: 1-5: Earth as a System of Interacting Components
17. The asthenosphere is
A) cool and strong.
B) cool and weak.
C) hot and strong.
D) hot and weak.
Ans: D
Section: 1-5: Earth as a System of Interacting Components

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18. What are the plates of plate tectonics made up of?
A) asthenosphere
B) crust
C) lithosphere
D) mantle
Ans: C
Section: 1-5: Earth as a System of Interacting Components
19. Which of the following relationships is correct?
A) asthenosphere = crust
B) lithosphere = crust
C) asthenosphere = crust + upper mantle
D) lithosphere = crust + upper mantle
Ans: D
Section: 1-5: Earth as a System of Interacting Components
20. The motion of a flowing material in which hot matter rises from the bottom and cool
matter sinks from the surface is called
A) accretion.
B) convection.
C) differentiation.
D) fusion.
Ans: B
Section: 1-5: Earth as a System of Interacting Components
21. Which of the following statements about convection is true?
A) Heat is transferred from hot material to cool material without inducing a flow.
B) Hot material flows upward and displaces cool material.
C) Cool material flows upward and displaces hot material.
D) Random circulation occurs.
Ans: B
Section: 1-5: Earth as a System of Interacting Components

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22. How old are the oldest rocks now found on Earth's surface?
A) 0.5 billion years
B) 4.0 billion years
C) 2.5 billion years
D) 4.5 billion years
Ans: B
Section: 1-6: An Overview of Geologic Time
23. Earth’s atmosphere has been oxygen-rich for __________ of Earth’s history.
A) approximately 25%
B) approximately 50%
C) approximately 75%
D) approximately 99%
Ans: B
Section: 1-6: An Overview of Geologic Time
24. Large continental masses had formed on Earth by
A) 0.3 billion years ago.
B) 2.5 billion years ago.
C) 1.0 billion years ago.
D) 4.0 billion years ago.
Ans: B
Section: 1-6: An Overview of Geologic Time
25. How old are the earliest fossil remains?
A) approximately 65 million years
B) approximately 2200 million years
C) approximately 540 million years
D) approximately 3500 million years
Ans: D

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Section: 1-6: An Overview of Geologic Time
26. When did biology's Big Bang (evolutionary explosion) occur?
A) approximately 65 million years ago
B) approximately 2.2 billion years ago
C) approximately 540 million years ago
D) approximately 3.5 billion years ago
Ans: C
Section: 1-6: An Overview of Geologic Time
27. What caused the mass extinctions 65 million years ago that ended the Age of
Dinosaurs?
A) major bolide impact
B) massive volcanic eruptions
C) global glaciation
D) all of the above
Ans: A
Section: 1-6: An Overview of Geologic Time
28. Stony meteorites are similar in composition to Earth’s
A) mantle.
B) crust.
C) inner core.
D) outer core.
Ans: A
Section: 1-4: Peeling the Onion: Discovery of a Layered Earth
29. The group of meteorites that is similar in composition to Earth’s core is
A) stony meteorites.
B) high-density meteorites.
C) iron-nickel meteorites.

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D) none of the above.
Ans: C
Section: 1-4: Peeling the Onion: Discovery of a Layered Earth
30. A ___________ aims to predict the complex behavior of Earth systems.
A) scientific hypothesis
B) scientific observation
C) scientific plan
D) scientific model
Ans: D
Section: 1-1: The Scientific Method
31. Change in the ground elevation of Earth’s surface is called
A) geodesy.
B) topography.
C) uniformitarianism.
D) none of the above
Ans: B
Section: 1-2: Earth's Shape and Surface
32. Elevation of the ground surface is measured relative to
A) Mount Everest.
B) the equator.
C) sea level.
D) the north pole.
Ans: C
Section: 1-2: Earth's Shape and Surface
33. The daily rotation of Earth causes the equatorial regions to _______ and the polar
regions to ________.

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A) bulge outward, flatten
B) flatten, bulge outward
C) bulge inward, flatten
D) flatten, bulge inward
Ans: A
Section: 1-2: Earth's Shape and Surface
34. The Mohorovičić discontinuity coincides with the __________ boundary.
A) mantle-core
B) crust-mantle
C) lithosphere-mantle
D) inner core-outer core
Ans: B
Section: 1-4: Peeling the Onion: Discovery of a Layered Earth
35. Continental crust is ________ oceanic crust.
A) less dense than
B) the same density as
C) more dense than
D) Geoscientists have no idea how dense the continental crust is.
Ans: A
Section: 1-4: Peeling the Onion: Discovery of a Layered Earth
36. Earth’s major layers include (from outermost to innermost):
A) inner core, outer core, mantle, crust.
B) outer core, inner core, mantle, crust.
C) crust, mantle, outer core, inner core.
D) crust, outer core, inner core, mantle.
Ans: C
Section: 1-4: Peeling the Onion: Discovery of a Layered Earth

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37. The plate tectonic system is driven by
A) magnetism.
B) the climate system.
C) solar heat.
D) internal heat.
Ans: D
Section: 1-5: Earth as a System of Interacting Components
38. The first evidence of erosion by water in the rock record occurred
A) 4000 Ma.
B) 3500 Ma.
C) 2500 Ma.
D) 3800 Ma.
Ans: D
Section: 1-6: An Overview of Geologic Time
39. The three major global geosystems are
A) climate system, solar system, and geodynamo system.
B) geodynamo system, plate tectonic system, and solar system.
C) climate system, geodynamo system, and plate tectonic system.
D) plate tectonic system, climate system, and solar system.
Ans: C
Section: 1-5: Earth as a System of Interacting Components
40. Solar energy energizes which of Earth’s components?
A) atmosphere
B) biosphere
C) hydrosphere
D) all of the above
Ans: D
Section: 1-5: Earth as a System of Interacting Components

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41. The first appearance of Homo sapiens on Earth occurred in
A) 16 Ma.
B) 0.16 Ma.
C) 1.6 Ma.
D) 1600 Ma.
Ans: B
Section: 1-6: An Overview of Geologic Time
42. How many major mass extinction events have occurred throughout Earth’s history?
A) 5
B) 10
C) 2
D) 1
Ans: A
Section: 1-6: An Overview of Geologic Time
43. The ability of Earth’s atmosphere to retain heat is referred to as the
A) solar effect.
B) radiation effect.
C) biosphere effect.
D) greenhouse effect.
Ans: D
Section: 1-5: Earth as a System of Interacting Components
44. Magnetic reversals of Earth’s magnetic field are when
A) Earth’s north and south poles flip.
B) Earth’s magnetic field decreases in intensity.
C) Earth’s magnetic poles wander.
D) Earth’s magnetic field increases in intensity.
Ans: A

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Section: 1-5: Earth as a System of Interacting Components
45. The typical elevation of the land surface occurs within a range of _______ above sea
level.
A) 0 to 20 km
B) 0 to 1 km
C) 0 to 10 km
D) 0 to 5 km
Ans: B
Section: 1-2: Earth's Shape and Surface
46. The typical depth of ocean basins is
A) 1 to 2 km.
B) 10 to 12 km.
C) 4 to 5 km.
D) 8 to 10 km.
Ans: C
Section: 1-2: Earth's Shape and Surface
47. The highest topographic point above sea level on Earth is at
A) Mount Himalaya.
B) Mount Mauna Loa.
C) Mount Marianas.
D) Mount Everest.
Ans: D
Section: 1-2: Earth's Shape and Surface
48. A scientific hypothesis that stands repeated testing can be elevated to a scientific
A) model.
B) fact.
C) theory.

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D) idea.
Ans: C
Section: 1-1: The Scientific Method
49. The average density of continental crust is ________ g/cm3.
A) 2.8
B) 3.4
C) 3.0
D) 4.0
Ans: A
Section: 1-4: Peeling the Onion: Discovery of a Layered Earth
50. Continents float high because they are
A) denser than the mantle.
B) less dense than the mantle.
C) the same density as the mantle.
D) thicker than the mantle.
Ans: B
Section: 1-4: Peeling the Onion: Discovery of a Layered Earth
51. Which of the following is not an integral part of the scientific method?
A) experimentation
B) observation
C) belief
D) criticism
Ans: C
Section: 1-1: The Scientific Method
52. In terms of its shape, Earth is
A) a perfect sphere.

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B) an imperfect sphere.
C) flattened at the poles and bulging at the equator.
D) bulging at the poles and flattened at the equator.
Ans: C
Section: 1-2: Earth's Shape and Surface
53. The densest part of Earth is the
A) oceanic crust.
B) continental crust.
C) mantle.
D) core.
Ans: D
Section: 1-4: Peeling the Onion: Discovery of a Layered Earth
54. The lithosphere is composed of =
A) uppermost crust.
B) lowermost crust.
C) crust and upper mantle.
D) mantle.
Ans: C
Section: 1-5: Earth as a System of Interacting Components
55. Geologist James Hutton advanced the principle of
A) uniformitarianism.
B) uniformity.
C) conformity.
D) universalism.
Ans: A
Section: 1-3: The Geologic Record

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