| List I | List II |
| A. Gutenberg discontinuity | 1. Abrupt increase of P-wave and S-Wave at the depth of 220 Km |
| B. Mohorovicic discontinuity | 2. Discontinuity between Earth's core and mantle |
| C. Lehmann discontinuity | 3. Discontinuity between Earth's crust and mantle |
| D. Conrad discontinuity crust | 4. Discontinuity between upper continental crust and lower continental |
A) A-4, B-3, C-2, D-1
B) A-2, B-1, C-4, D-3
C) A-2, B-3, C-4, D-1
D) A-2, B-3, C-1, D-4
Correct Answer: D
Solution :
[d] Gutenberg discontinuity - Zone separating the lower mantle from the core. Mohorovicic discontinuity - Zone that separates the Earth's crust from the asthenosphere. Lehmann discontinuity - Abrupt increase of P-wave and S-wave velocities at the depth of 220 ± 30 km. Conrad discontinuity - Zone corresponds to the sub-horizontal boundary incontinental crust at which the seismic wave velocity increases in a discontinuous way
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