8th Grade Science Unit 7/8: Tectonics

Multiple ChoiceIdentify the choice that best completes the statement or answers the question.____ 1. The youngest rocks on the ocean floor are located ____.

a. near continents c. far from mid-ocean ridgesb. at mid-ocean ridges d. near Asia

____ 2. Plates of the lithosphere float on the ____.a. crust c. coreb. asthenosphere d. atmosphere

____ 3. The presence of the same ____ on several continents supports the hypothesis of continental drift.a. fossils b. rock strata c. neither a nor b d. both a and b

____ 4. The hypothesis that continents have slowly moved to their current locations is called ____.a. continental drift b. continental slope c. magnetic reversal d. convection

____ 5. Plates move apart at ____ boundaries.a. convergent b. stable c. divergent d. transform

____ 6. Matching ____ on different continents are evidence for continental drift.a. river systems c. weather patternsb. rock structures d. wind systems

____ 7. Bands of rock on the seafloor showing alternating magnetic orientation indicate the seafloor further from the mid-ocean rift is _______.a. older b. younger c. hotter d. thinner

____ 8. ____ currents inside Earth might help drive plate motion.a. Vertical b. Convection c. Horizontal d. none of these

____ 9. At a transform plate boundary, ____.a. plates grind past each other c. plates convergeb. plates diverge d. hot spots form

____ 10. At a divergent plate boundary, ____.a. one plate slides under another plate c. plates grind past each otherb. the edge of a plate melts, becomes magma d. plates move apart

____ 11. The layer on which the tectonic plates move is the ____.a. lithosphere b. asthenosphere c. core d. crust

____ 12. According to Figure 10-1, what type of plate boundary occurs between the North American Plate and the Eurasian Plate?a. transform boundary c. convergent oceanic-continental boundaryb. divergent boundary d. convergent oceanic-oceanic boundary

____ 13. According to Figure 10-1, what type of plate boundary occurs between the Nazca Plate and the South American Plate?a. convergent oceanic-continental boundary c. convergent continental-cont. boundaryb. convergent oceanic-oceanic boundary d. transform boundary

____ 14. What is the relationship of the dense oceanic crust that is produced at a divergent plate boundary to the convergence or collision of an oceanic plate and a continental plate, such as the western margin of South America in the diagram below?

a. It is more dense than the more boyant continental crust that it is pulled underb. It is less dense than the less boyand continental crust that it pushes underc. It has the same density as the continental crust it slams intod. The two have no relationship

____ 15. What process is most likely responsible for the disappearance of the volcanic island in the image above?a. The reef consumes the rock c. divergent boundaries form a trenchb. weathering and erosion d. converging boundaries form a rift

____ 16. On the contour map above, where might a delta form?a. to the left b. to the right c. above d. below

____ 17. If the river in the topographic map illustrated in the previous question cut a deeper canyon over time, what would the topographic map of the area look like?a. c.

b. d.

____ 18. If you weathered the formation represented above for a number of years, it could reshape the:a. top of the land form to increase elevation

b. top of the land form to decrease elevation

c. right side of the land form to create a cave

d. land form to create a canyon

____ 19. Where would the youngest ocean floor be found?

a. I b. II c. III d. IV____ 20. Which area on the terrain above would show an area with a divergent plate

boundary?

a. A b. B c. C d. D____ 21. Which area on the terrain above would show an area with a convergent plate

boundary?

a. A b. B c. C d. D

The following is a model of how a volcano is formed in the ocean. Clay is used to represent lava coming out of the ground. The clay is pushed through a hole in the bottom of a fish tank.The following forms.

You can see how the clay comes through the bottom, and slowly forms an island that is above the water. Afterwords, fishing line is used to cut off pieces of the island to show how the volcano will weather.

____ 22.

Which of the following series of topographic maps represents the formation and weathering of the volcano in the clay model?

a. 1, 2, 3, 4, 5 b. 2, 3, 4, 1, 5 c. 1, 3, 4, 2, 5 d. 1, 4, 3, 2, 5

Match each picture with the correct plate boundarya. convergentb. divergentc. transform

____ 23.

____ 24.

____ 25.

8th Grade Science Unit 7/8: Tectonics

Answer Section

MULTIPLE CHOICE

1. ANS: B PTS: 1 DIF: B OBJ: 4/2STA: 8.3D | 8.7A | 8.12A | 8.14 | 8.14A

2. ANS: B PTS: 1 DIF: B OBJ: 3/2STA: 8.3D | 8.7 | 8.7B | 8.12A | 8.14A

3. ANS: D PTS: 1 DIF: B OBJ: 2/1STA: 8.2C | 8.2D | 8.3C | 8.12A | 8.14A

4. ANS: A PTS: 1 DIF: A OBJ: 1/1STA: 8.3A | 8.3D | 8.12A | 8.14A

5. ANS: C PTS: 1 DIF: B OBJ: 5/3STA: 8.2C | 8.3 | 8.14A

6. ANS: B PTS: 1 DIF: B OBJ: 2/1STA: 8.2C | 8.2D | 8.3C | 8.12A | 8.14A

7. ANS: A PTS: 1 DIF: A OBJ: 4/2STA: 8.3D | 8.7A | 8.12A | 8.14 | 8.14A

8. ANS: B PTS: 1 DIF: B OBJ: 6/3STA: 8.2C | 8.4A | 8.12A | 8.14A

9. ANS: A PTS: 1 DIF: B OBJ: 7/3STA: 8.7 | 8.7A | 8.7B | 8.14A

10. ANS: D PTS: 1 DIF: B OBJ: 7/3STA: 8.7 | 8.7A | 8.7B | 8.14A

11. ANS: B PTS: 1 DIF: B OBJ: 7/3STA: 8.7 | 8.7A | 8.7B | 8.14A

12. ANS: B PTS: 1 DIF: A OBJ: 5/3STA: 8.2C | 8.3 | 8.14A

13. ANS: A PTS: 1 DIF: A OBJ: 5/3STA: 8.2C | 8.3 | 8.14A

14. ANS: A PTS: 115. ANS: B PTS: 116. ANS: A PTS: 117. ANS: B PTS: 118. ANS: B PTS: 119. ANS: C PTS: 120. ANS: C PTS: 121. ANS: A PTS: 122. ANS: D PTS: 1

MATCHING

23. ANS: A PTS: 124. ANS: C PTS: 125. ANS: B PTS: 1