1. True or False
The volcano shown with its long, gentle slopes would best be described as a shield volcano. X

2. ANSWER?
Click arrow for next question

3. True or False
Magma erupts through an opening in Earth’s crust called a vent. X

4. ANSWER?
Click arrow for next question

5. True or False
Volcanoes associated with convergent plate boundaries form the Circum-Pacific and the Mediterranean Belts. X

6. ANSWER?
Click arrow for next question

7. True or False
Composite volcanoes are made of basaltic lava. X

8. ANSWER?
Click arrow for next question

9. True or False
Cinder-cone volcanoes have steep sides and are generally the smallest volcanoes. X

10. ANSWER?
Click arrow for next question

11. True or False
Temperature and pressure decrease with depth beneath Earth’s surface. X

12. ANSWER?
Click arrow for next question

13. True or False
A pluton is an intrusive metamorphic rock body formed from magma. X

14. ANSWER?
Click arrow for next question

15. True or False
The hotter the magma or lava, the greater is its viscosity. X

16. ANSWER?
Click arrow for next question

17. True or False
Lava that has low viscosity moves slower than lava with high viscosity X

18. ANSWER?
Click arrow for next question

19. True or False
All volcanoes form at plate boundaries. X

20. ANSWER?
Click arrow for next question

21. Internal resistance to flow is
a. Silica
b. Tephra
c. pyroclastic
d. viscosity X

22. ANSWER?
Click arrow for next question

23. Depression that forms when the top or side of a volcano collapses into the magma chamber is a
a. Caldera
b. Pluton
c. Tephra
d. Pyroclastic material X

24. ANSWER?
Click arrow for next question

25. Opening in Earth’s crust through which lava erupts
a. Caldera
b. Crater
c. Pluton
d. Vent X

26. ANSWER?
Click arrow for next question

27. Types of plutons include ____.
a. shields, cinder-cones, and composites
b. vents, craters, and calderas
c. dust, ash, lapilli, volcanic blocks, and volcanic bombs
d. batholiths, stocks, sills, dikes, and laccoliths X

28. ANSWER?
Click arrow for next question

29. Using the diagram to the right, which letter represents the crater associated with the volcano?
a. A
b. B
c. C
d. D X

30. ANSWER?
Click arrow for next question

31. Using the diagram to the right, which letter represents the magma chamber associated with the volcano?
a. A
b. B
c. C
d. D X

32. ANSWER?
Click arrow for next question

33. Bowl-shaped depression around a vent at the top of a volcano is a
a. Caldera
b. Crater
c. Pluton
d. Vent X

34. ANSWER?
Click arrow for next question

35. According to the diagram, which Hawaiian Island is the oldest?
a. Loihi
b. Hawaii
c. Kauai
d. Molokai X

36. ANSWER?
Click arrow for next question

37. Broad, gently sloping sides
a. shield volcano
b. cinder-cone volcano
c. composite volcano X

38. ANSWER?
Click arrow for next question

39. Made of layers of tephra and lava
a. shield volcano
b. cinder-cone volcano
c. composite volcano X

40. ANSWER?
Click arrow for next question

41. X Steep-sided a. shield volcano b. cinder-cone volcano
c. composite volcano X

42. ANSWER?
Click arrow for next question

43. Largest of the volcanoes
a. shield volcano
b. cinder-cone volcano
c. composite volcano X

44. ANSWER?
Click arrow for next question

45. Forms from layers of basaltic lava
a. shield volcano
b. cinder-cone volcano
c. composite volcano X

46. ANSWER?
Click arrow for next question

47. Forms as tephra ejected high into the air fall back to Earth and pile around the vent
a. shield volcano
b. cinder-cone volcano
c. composite volcano X

48. ANSWER?
Click arrow for next question

49. Forms in the upper mantle
a. basaltic magma
b. andesitic magma
c. rhyolitic magma X

50. ANSWER?
Click arrow for next question

51. Magma with the lowest viscosity
a. basaltic magma
b. andesitic magma
c. rhyolitic magma X

52. ANSWER?
Click arrow for next question

53. Most explosive form of magma
a. basaltic magma
b. andesitic magma
c. rhyolitic magma X

54. ANSWER?
Click arrow for next question

55. Which type of magma is in #1?
Magma Characteristics
Type of Magma
Source Material
Viscosity
Gas Content 1. 2. 3.
1–2%
Andesitic magma 4. 5.
3–4%
Rhyolitic magma
Continental crust 6.
4-6%
Which type of magma is in #1?

56. ANSWER?
Click arrow for next question

57. What is the viscosity of basaltic magma, low, medium or high?
Magma Characteristics
Type of Magma
Source Material
Viscosity
Gas Content
Basaltic magma
Upper mantle 3.
1–2%
Andesitic magma
Oceanic Crust 5.
3–4%
Rhyolitic magma
Continental crust 6.
4-6%
What is the viscosity of basaltic magma, low, medium or high?

58. ANSWER?
Click arrow for next question

59. What is the viscosity of andesitic magma, low, medium or high?
Magma Characteristics
Type of Magma
Source Material
Viscosity
Gas Content
Baslatic magma
Upper mantle
Low
1–2%
Andesitic magma
Oceanic Crust 5.
3–4%
Rhyolitic magma
Continental crust 6.
4-6%
What is the viscosity of andesitic magma, low, medium or high?

60. ANSWER?
Click arrow for next question

61. What is the viscosity of rhyolitic magma, low, medium or high?
Magma Characteristics
Type of Magma
Source Material
Viscosity
Gas Content
Basaltic magma
Upper mantle
Low
1–2%
Andesitic magma
Oceanic Crust
Medium
3–4%
Rhyolitic magma
Continental crust 6.
4-6%
What is the viscosity of rhyolitic magma, low, medium or high?

62. ANSWER?
Click arrow for next question

63. How is convergent volcanism different from divergent volcanism?X

64. ANSWER?
Click arrow for next question

65. Contrast the three major types of volcanoes.X

66. ANSWER?
Click arrow for next question

67. Final Jeopardy
Why does lava containing large amounts of dissolved gases generally produce a more violent explosion than lava that contains small amounts of dissolved gases?