Physical Science
11th Edition
ISBN: 9780077862626
Author: Bill Tillery, Stephanie J. Slater, Timothy F. Slater
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 18, Problem 43AC
The asthenosphere is not defined as
a. rigid.
b. plastic.
c. mobile.
d. elastic.
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Students have asked these similar questions
5. The "iceberg analogy" for the isostatic equilibrium of the continental crust turns out to be quite
the relative density of icebergs versus seawater is close to the relative density of continental crust versus mantle.
Glacial ice is about 15% less dense than seawater; likewise continental crust is about 15% less dense than the
mantle. This leads to a simple rule that we can call the 1-to-8 rule: for every 1 unit of extra elevation for an
iceberg or a mountain belt, there need to be 8 units of total thickness. These iceberg examples illustrate the
idea:
an iceberg 3 meters
above sea level is
24 meters thick
an iceberg 1 meter
above sea level is
8 meters thick
an iceberg 2 meters
above sea level is
16 meters thick
3m
2m
water level
1m
>7m
14m
21m
For the following questions, apply the 1-to-8 rule, assuming continental crust in isostatic equilibrium.
a. Continental crust at sea level averages about 35 kilometers thick. (1 km = 0.6 miles.) Therefore,
in general, how thick must the crust…
12. Which part of the earth makes up about one-third of earth’s total mass and is mostly iron witha solid part and a part that acts like a liquid?A. mantle
B. core
C. crust
D. asthenosphere
Which of the following is most responsible for the
formation of new crust ar the edge of a tectonic
plate?
A. mountain building at a continent-continent
convergent boundary
B. magma rising up from the mantle at a
divergent boundary
С.
two tectonic plates sliding past one another at
a transform boundary
D.
subduction of one oceanic plate under another
at a convergent boundary
Chapter 18 Solutions
Physical Science
Ch. 18 - 1. The core of Earth is composed of
a. iron and...Ch. 18 - 2. The middle part of Earth's interior is
a....Ch. 18 - 3. The separation of materials that gave Earth its...Ch. 18 - 4. A vibration that moves through any part of...Ch. 18 - 5. The S-wave is a
a. longitudinal wave.
b....Ch. 18 - 6. Waves that occur where S- or P-waves reach the...Ch. 18 - 7. The three main areas of Earth’s interior are
a....Ch. 18 - 8. The boundary between the crust and the mantle...Ch. 18 - 9. The mantle is composed of
a. sulfides.
b....Ch. 18 - 10. Seismological studies suggests that the...
Ch. 18 - 11. Evidence from meteorite studies proposes that...Ch. 18 - 12. The layer in Earth where seismic waves sharply...Ch. 18 - 13. The layer that is broken up into plates that...Ch. 18 - 14. The name of the single large continent...Ch. 18 - 15. Records of the strength and directions of...Ch. 18 - 16. The chain of mountains found in the center of...Ch. 18 - 17. Long, deep, and narrow oceanic trenches are...Ch. 18 - 18. The theory that the lithosphere is composed of...Ch. 18 - 19. The plate boundary associated with the...Ch. 18 - 20. The movement of one plate under another plate...Ch. 18 - 21. Transform boundaries occur when
a. two plates...Ch. 18 - 22. What is the current theory about why the...Ch. 18 - 23. The seismic waves that cause the most damage...Ch. 18 - 24. Earth’s mantle has a chemical composition that...Ch. 18 - 25. From seismological data, Earth’s shadow zone...Ch. 18 - 26. The Mohorovicic discontinuity is a change in...Ch. 18 - 27. The oldest rocks are found in
a. continental...Ch. 18 - 28. The least dense rocks are found in
a....Ch. 18 - 29. The idea of seafloor spreading along the...Ch. 18 - 30. According to the plate tectonics theory,...Ch. 18 - 31. The presence of an oceanic trench, a chain of...Ch. 18 - 32. The presence of an oceanic trench with shallow...Ch. 18 - 33. The ongoing occurrence of earthquakes without...Ch. 18 - 34. The evidence that Earth's core is part liquid...Ch. 18 - 35. The surfaces of early planets in our solar...Ch. 18 - 36. The early Earth’s core is thought to have...Ch. 18 - 37. Indirect evidence that supports the theory of...Ch. 18 - 38. The oceanic crust is
a. thicker than the...Ch. 18 - 39. Seismic waves that do not travel through...Ch. 18 - 40. The fastest seismic wave is the
a. P-wave.
b....Ch. 18 - 41. Information about the composition and nature...Ch. 18 - 42. Primary information about the nature of the...Ch. 18 - 43. The asthenosphere is not defined as
a....Ch. 18 - 44. Earth’s magnetic field is thought to be...Ch. 18 - 45. Studies of the Mid-Atlantic Ridge provided...Ch. 18 - 46. Evidence that supports seafloor spreading does...Ch. 18 - 47. A geologic feature that was produced by...Ch. 18 - 48. Which type of plate boundary accounts for the...Ch. 18 - 49. Which type of plate boundary was responsible...Ch. 18 - 50. A famous transform boundary in the United...Ch. 18 - 51. Plate movement is measured by
a. reflected...Ch. 18 - 52. Islands that form when melted subducted...Ch. 18 - 1. Describe one theory of how Earth came to have a...Ch. 18 - 2. Briefly describe the internal composition and...Ch. 18 - 3. What is the asthenosphere? Why is it important...Ch. 18 - 4. Describe the parts of Earth included in the (a)...Ch. 18 - 5. What is continental drift? How is it different...Ch. 18 - 6. Rocks, sediments, and fossils around an oceanic...Ch. 18 - 7. Describe the origin of the magnetic strip...Ch. 18 - 8. Explain why ancient rocks are not found on the...Ch. 18 - 9. Describe the three major types of plate...Ch. 18 - 10. What is an island arc? Where are they found?...Ch. 18 -
11. Briefly describe a model that explains how...Ch. 18 - 12. Briefly describe the theory of plate tectonics...Ch. 18 - 13. What is an oceanic trench? What is the...Ch. 18 - 14. Describe the probable source of all the...Ch. 18 - 15. The northwestern coast of the United States...Ch. 18 - 16. Explain how the crust of Earth is involved in...Ch. 18 - 1. Why are there no active volcanoes in the...Ch. 18 - 2. Describe cycles that occur on Earth's surface...Ch. 18 - 3. Discuss evidence that would explain why plate...Ch. 18 - 4. Analyze why you would expect most earthquakes...Ch. 18 - 1. The rate at which the temperature increases...Ch. 18 - 2. Based on a geothermal gradient of 15°C/km, what...Ch. 18 - Prob. 3PEBCh. 18 - 4. What is the pressure, in N/m2, at the depth of...Ch. 18 - 5. What is the pressure, in N/m2, at a depth of 75...Ch. 18 - 6. What is the pressure, in N/m2, at the base of...Ch. 18 - 7. Wood floating in water can demonstrate how the...Ch. 18 - 8. A teacher would like to demonstrate the...Ch. 18 - 9. A survey of a mid-oceanic ridge determined the...Ch. 18 - 10. GPS stations on two separate plates have...Ch. 18 - 11. What is the geothermal gradient along a...Ch. 18 - 12. What are the subduction direction and slope of...Ch. 18 - 13. What are the subduction direction and slope,...Ch. 18 - 14. Earthquake data from a subduction zone are...Ch. 18 - 15. The North American Plate is moving west at a...
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