21. Magma solidifies creating new basaltic crust (a) a. Divergent boundary 

b. Transform boundary 

c. Convergent boundary 

22. A deep sea trench may mark the boundary (c) 

a. Divergent boundary 

b. Transform boundary 

c. Convergent boundary 

– 43 – GEOLOGY C105 

23. Subduction occurs often forming mountains (c) 

a. Divergent boundary 

b. Transform boundary 

c. Convergent boundary 

24. Site of destruction of the lithosphere (C) 

a. Divergent boundary 

b. Transform boundary 

c. Convergent boundary 

25. Plates slide past each other (b) 

a. Divergent boundary 

b. Transform boundary 

c. Convergent boundary 

26. Plates move apart (a) 

a. Divergent boundary 

b. Transform boundary 

c. Convergent boundary 

27. Neither creates nor destroys lithosphere (b) 

a. Divergent boundary 

b. Transform boundary 

c. Convergent boundary 

28. Most are on the ocean floor (a) 

a. Divergent boundary 

b. Transform boundary 

c. Convergent boundary 

29. Least abundant type of boundary (b) 

a. Divergent boundary 

b. Transform boundary 

c. Convergent boundary 

30. Collision sometimes occurs forming tall mountains (c) 

a. Divergent boundary 

b. Transform boundary 

c. Convergent boundary 

31. A striped pattern of alternating positive and negative magnetic polarity parallel to and on both sides of a mid-oceanic ridge is called ___________. a. magnetic reversal 

b. magnetic zonation 

c. magnetic alignment 

d. magnetic polarity 

GEOLOGY C105 – 44 – 

32. ________ is the area encircling the Pacific Ocean that contains many of the Earth’s active volcanoes. a. a deep sea trench 

b. the Ring of Fire 

c. the bajada 

d. coastal plain 

33. ________ is a long narrow, deep depression in the ocean floor where subduction takes place. a. a deep sea trench 

b. the continental sheet 

c. a blowout 

d. the abyssal plain 

34. The measurement of deep water in lakes, rivers and oceans is called ________. a. Sonar 

b. Seismology 

c. Bathymetry 

d. spectronomy 

35. Molten rock within the earth’s interior is called ________. a. Lava 

b. Bedrock 

c. Cinder 

d. magma 

36. The reversing of earth’s north and south magnetic poles is known as ________ a. magnetic reversal b. magnetic zonation c. magnetic alignment d. magnetic polarity 

37. ________ is a technology that creates images by emitting sound waves and interpreting the returning echoes. a. Sonar 

b. Seismology 

c. Bathymetry 

d. spectronomy 

38. The ________ theory holds that the earth is expanding, which has broken apart crust creating surface features. a. contracting earth 

b. frozen earth 

c. expanding earth 

d. magnetic earth 

– 45 – GEOLOGY C105 

39. The supercontinent proposed by Alfred Wegner is called________ a. Laurasia 

b. Pangaea 

c. Gondwanaland 

d. Eurasia 

40. ___________are more numerous near deep-sea trenches, providing evidence that these features are subduction zones. a. abyssal hills 

b. abyssal plains 

c. Earthquakes 

d. smokers