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Earth Science
Chapter 17
Worksheet 1
Name ____________________________
Block ____________________________
Match the definitions to the correct word or term
____
1. Convergent boundaries
A. The process that occurs when the weight of a subducting
plate helps pull the trailing lithospheric plate into the
subduction zone
____
2. Pangaea
____
3. Magnetic reversal
____
4. Tectonic plate
____
5. Seafloor spreading
B. The study of Earth’s magnetic record using data from
rocks containing iron-bearing minerals that have recorded
the orientation of Earth’s magnetic field
C. The process where one tectonic the plates descends
beneath another
D. Lines on a map that connect points that have the same
age
E. Ancient landmass made up of all the continents that began
to break apart about 200 million years ago
____
6. Subduction
F. A hypothesis which proposed that Earth’s continents had
once been joined as a single landmass
____
____
____
7. Rift valley
8. Slab pull
9. Paleomagnetism
____
10. Transform boundary
G. A place where two plates slide horizontally past each other
H. Changes in Earth’s magnetic field over geologic time
I. The process that occurs when the weight of the uplifted
ridge pushes an oceanic plate toward the trench formed at
the subduction zone
J. A device that can detect small changes in magnetic fields
____
11. Divergent boundaries
____
12. Continental drift
____
13. Isochron
____
14. Ridge push
____
15. Magnetometer
K. Places where two tectonic plates are moving toward each
other
L. Places where two tectonic plates are moving apart
M. The theory that states that new ocean crust is formed at
ocean ridges and destroyed at deep-sea trenches
N. Long, narrow depression that forms when continental crust
begins to separate at a divergent boundary
O. Huge pieces of Earth’s crust that cover its surface and fit
together at their edges
Circle the letter that corresponds to the correct answer
16. What was Wegener’s hypothesis called?
a. Seafloor spreading
b. Plate tectonics
c. Continental drift
d. Slab pull
17. The fit of the coastlines of which of the following continents led people to suggest that the
continents drifted apart
a. North and South America
b. North America and Africa
c. South America and Africa
d. Europe and North America
18. Which of the following evidence was used by Wegener to support his hypothesis that the
continents had once been joined?
a. Rock types and ages
b. Plate tectonics
c. Slab pull and ridge push
d. Fossil of ocean plants
19. Which of the following was not used by Wegener to support his hypothesis of continental drift?
a. Fossils of land-dwelling animals
b. Paleomagnetic data
c. Coal beds in Antarctica
d. Glacial deposits
20. Why was the hypothesis of continental drift rejected when it was proposed by Wegener?
a. Wegener thought that the south pole had changed positions
b. Wegener thought that Earth’s rotation was the driving force
c. Wegener couldn’t explain how or why continents moved
d. Wegener died in Greenland in 1930
21. Many early mapmakers thought Earth’s continents had moved based on
a. Plate boundary locations
b. Fossil evidence
c. Climatic data
d. Matching coastlines
22. Compared to ocean crust near deep-sea trenches, crust near ocean ridges is
a. Younger
b. Older
c. The same age
d. Magnetically reversed
23. Each cycle of spreading and intrusion of magma during seafloor spreading results in
a. Magnetic reversals
b. New ocean crust
c. Subduction
d. Plates colliding
24. Features found at divergent boundaries include
a. Ocean ridges
b. Deep-sea trenches
c. Crumpled mountains
d. Island arc islands
25. Subduction results in the formation of
a. A deep-sea trench
b. A magnetic reversal
c. A rift valley
d. New continental crust
26. Continental-continental plate collisions produce
a. Island arcs
b. Rift valleys
c. Deep-sea trenches
d. Very tall mountain ranges
27. Crust is neither destroyed nor formed along which of the following boundaries?
a. Convergent
b. Divergent
c. Transform
d. Magnetic
28. The driving force of tectonic plates are related to convection currents in Earth’s
a. Crust
b. Mantle
c. Inner core
d. Outer core
Fill in the blanks with the appropriate term from the answer bank
Continental drift
Magnetic reversal
Divergent boundaries
Transform boundaries
Magnetometer
Seafloor spreading
Rift valley
Convection
Paleomagnetism
Theory of plate tectonics
Convergent boundaries
Subduction
Pangaea
Isochron
Slab pull
Ridge push
29. ________________________ is a process that occurs at convergent boundaries
30. Wegener’s hypothesis of _______________________ stated that Earth’s continents had once
been joined as a single landmass
31. The study of Earth’s magnetic record is known as __________________________
32. A map line connecting points that have the same age is a(n) __________________________
33. The _____________________________ states that Earth’s crust and rigid upper mantle are
broken into enormous slabs called plates that move slowly over Earth’s surface
34. ____________________ are places where plates slide horizontally past each other
35. _____________________ is a process whereby the weight of an uplifted ocean ridge pushes an
oceanic plate toward a subduction zone
36. The transfer of thermal energy by the movement of heated matter is __________________
37. Places where plates move apart are ___________________________
38. _________________ occurs when one tectonic plate descends beneath another
39. Earth’s continents were once joined as a single landmass called ___________________
40. A(n) ___________________ detects small changes in Earth’s magnetic field
41. The theory of ________________________ explains how new ocean crust is created at ocean
ridges and destroyed in deep-sea trenches
42. Plates come together at ________________________________
43. A long, narrow, fault-bounded, continental depression is a(n) ______________________
44. A change in Earth’s magnetic field is called a(n) _____________________________
Answer the following questions
45. What early evidence suggested that Earth’s continents might be moving?
46. How did Alfred Wegener use rock and fossil evidence to support his hypothesis?
47. How do ocean ridges and deep-sea trenches support the theory of seafloor spreading?
48. Explain what happens at the three types of plate boundaries
49. What are the relationships among mantle convection, ocean ridges, and subduction zones?