NAME: _______________________________
Date: ____________ Period: ___
Unit 3 exam
Directions: complete each question to the best of your ability. Good Luck!
1-4. Label each layer of the earth from the diagram below
Directions: Match each of the following words to their correct definition.
Lithosphere
Sea-floor spreading
Asthenosphere
Deep ocean trench
Pangaea
Subduction
Mid-ocean ridges are sites where old
crust sinks into the asthenosphere.
Continental
drift
theory
of plate tectonics
true
Mid-false
ocean ridge
Transform boundary
divergent boundary
convergent boundary
crust
mantle
5. ______ The layer of rock that forms Earth's outer surface.
6. ______ The layer of hot, solid material between Earth's crust and core.
7. ______ A rigid layer made up of the uppermost part of the mantle and the crust.
8. ______ The soft layer of the mantle on which the lithosphere floats.
9. ______ A layer of molten iron and nickel that surrounds the inner core of Earth.
10. _____ A dense sphere of solid iron and nickel in the center of Earth.
11. _____ The name of the single landmass that broke apart 225 million years ago and gave
rise to today's continents.
12. _____ The hypothesis that the continents slowly move across Earth's surface.
13. _____ The undersea mountain chain where new ocean floor is produced; a divergent plate
boundary.
14. _____ The process by which molten material adds new oceanic crust to the ocean floor.
15. _____ A deep valley along the ocean floor through which oceanic crust slowly sinks toward
the mantle.
16. _____ The process by which oceanic crust sinks beneath a deep-ocean trench and back
into the mantle at a convergent plate boundary.
17. _____ The theory that pieces of Earth's lithosphere are in constant motion, driven by
convection currents in the mantle.
18. _____ A plate boundary where two plates move past each other in opposite directions.
19. _____ A plate boundary where two plates move away from each other.
20. _____ A plate boundary where two plates move toward each other.
21. A __________ occurs wherever two plates move toward each other.
H. transform boundary
B. convergent boundary
A. continental boundary
F. mid-ocean ridge
22. Pangaea was a supercontinent that existed about 200 million years ago.
true
false
23. How do Earth's crust and mantle differ?
A. The mantle is much thinner and denser than the crust.
B. The mantle is much thicker and less dense than the crust.
C. The crust is much thinner and denser than the mantle.
D. The crust is much thinner and less dense than the mantle
24. Plates move horizontally past each other along a __________ boundary.
A. transform boundary
B. magnetic
C. divergent
D. convergent
25. Which of these did Wegener use to support his theory of continental drift?
A. similar rocks and similar fossils on different continents
B. sea-floor spreading and similar rocks on different continents
C. convection currents in the asthenosphere and sea-floor spreading
D. fossils from ancient organisms and convection currents in the asthenosphere
26. Earth's inner core and outer core are both
A. completely solid spheres
B. parts of the molten asthenosphere
C. made up of hot metals
D. parts of Earth's rigid lithosphere
27. At transform boundaries, two plates
A. scrape past each other
B. pull away from each other
C. do not move in any direction
D. push against each other
28. Which of Earth's layers makes up the center of Earth?
A mantle
B outer core
C crust
D inner core
29. Oceanic crust at a mid-ocean ridge is
A. younger than crust near a trench
B. much older than continental crust
C. about the same age as continental crust
D. older than crust near a trench
30. A continental-continental collision causes
A. oceanic-oceanic subduction to occur
B. oceanic-continental subduction to occur
C. hot spots to form
D. mountain ranges to form
31. __________ Mountains are the most common type of mountain and the world’s largest
mountain ranges.
A.
B.
C.
D.
Dome mountains
Fault block mountains
Fold mountains
Volcanic mountains
32. The ______________ volcano is the most dangerous type of volcano due to its huge
height and size.
A.
B.
C.
D.
Dome volcano
Stratovolcano
Lava volcano
None of the above
33. This volcano destroyed the city of Pompeii in 79 AD
A.
B.
C.
D.
Mount Rainier
Mount k2
Mount Krakatau
Mount Vesuvius
34. The _____________ is used to rate the magnitude of an earthquake, or the amount of
energy it released.
A.
B.
C.
D.
Richter scale
Magnitude scale
Earthquake scale
Rider scale
35. A _____________ is a series of water waves caused by the displacement of a large
volume of a body of water.
A.
B.
C.
D.
Earthquake
Natural disaster
Tsunami
Tidal wave
BONUS QUESTIONS:
 Use the diagram to answer each question.
1. Which type of plate boundary occurs at X?
2. What is happening at Z?
3. Which type of plate boundary occurs at Y?