41. The most abundant metal in the Earth's crust is:
Answer: b) Aluminium
42. The core of the Earth is primarily composed of:
Answer: a) Nickel and Iron (NiFe)
43. The thickness of the Earth's crust ranges from:
Answer: a) 5-50 km
44. The Earth's radius is approximately:
Answer: c) 6,370 km
45. The term "lithosphere" refers to:
Answer: b) Crust and upper mantle
46. Which discontinuity separates the outer core from the inner core?
Answer: c) Lehmann Discontinuity
47. The oceanic crust is:
Answer: b) Thinner and denser than continental crust
48. The asthenosphere is:
Answer: b) A semi-molten layer below the lithosphere
49. P-waves can travel through:
Answer: c) Solids, liquids, and gases
50. The Richter Scale is:
Answer: b) Logarithmic
51. The continental crust is primarily composed of:
Answer: b) Granite
52. A boundary where two plates slide past each other horizontally is called:
Answer: c) Transform boundary
53. The Mid-Atlantic Ridge is an example of a:
Answer: b) Divergent boundary
54. The Himalayas were formed due to a:
Answer: c) Convergent boundary (continent-continent collision)
55. The San Andreas Fault is an example of a:
Answer: c) Transform boundary
56. The lithosphere includes:
Answer: b) Crust and upper mantle
57. The layer directly below the lithosphere is the:
Answer: b) Asthenosphere
58. Earth's magnetic field is generated in the:
Answer: c) Outer core
59. The term "SiMa" refers to the composition of the:
Answer: b) Mantle
60. The term "NiFe" refers to the composition of the:
Answer: c) Core
61. The Gutenberg Discontinuity separates the:
Answer: c) Mantle and outer core
62. The Repiti Discontinuity separates the:
Answer: b) Upper and lower mantle
63. The Lehmann Discontinuity separates the:
Answer: b) Outer and inner core
64. The Mohorovičić Discontinuity separates the:
Answer: a) Crust and mantle
65. The Conrad Discontinuity separates the:
Answer: a) Oceanic and continental crust
66. The shadow zone is caused by the absence of:
Answer: b) S-waves
67. The point on Earth's surface directly above an earthquake's focus is called:
Answer: b) Epicenter
68. The Richter Scale measures the _____ of an earthquake.
Answer: b) Magnitude
69. The Mercalli Scale measures the _____ of an earthquake.
Answer: b) Intensity
70. The most destructive seismic waves are:
Answer: c) Surface waves (L-waves)
71. The fastest seismic waves are:
Answer: a) P-waves
72. The instrument used to detect seismic waves is called a:
Answer: b) Seismograph
73. The "Ring of Fire" is associated with:
Answer: b) Convergent boundaries
74. The Mid-Atlantic Ridge is associated with:
Answer: a) Divergent boundaries
75. The San Andreas Fault is associated with:
Answer: c) Transform boundaries
76. The Himalayan Mountains formed due to the collision of the _____ and _____ plates.
Answer: b) Eurasian & Indian
77. The Earth's core is divided into _____ and _____ core.
Answer: c) Inner & outer
78. The outer core is in a _____ state.
Answer: b) Liquid
79. The inner core is in a _____ state.
Answer: a) Solid
80. The primary cause of plate movement is:
Answer: b) Convection currents in the mantle