Question

Match the seismic discontinuity in Group I with their occurrence in Earth's interior in Group II. 
\[\begin{array}{|l|l|} \hline \textbf{Group I} & \textbf{Group II} \\ \hline \text{P. Conrad} & \text{1. Between lower mantle and outer core} \\ \hline \text{Q. Mohorovičić} & \text{2. Between crust and upper mantle} \\ \hline \text{R. Gutenberg} & \text{3. Between inner and outer core} \\ \hline \text{S. Lehmann} & \text{4. Between lower and upper crust} \\ \hline \end{array}\]

• A. P-4, Q-2, R-1, S-3
• B. P-4, Q-2, R-3, S-1
• C. P-3, Q-2, R-4, S-1
• D. P-2, Q-4, R-1, S-3

Hint:

When identifying seismic discontinuities, remember that the Mohorovičić is between the crust and upper mantle, while the Conrad is between the crust layers, and the Gutenberg and Lehmann correspond to the core-mantle boundaries.

Answer 1

The Correct Option is A

Step 1: Identifying the seismic discontinuities and their occurrences.
- The Conrad discontinuity is located between the lower and upper crust.
- The Mohorovičić (Moho) discontinuity is located between the crust and upper mantle.
- The Gutenberg discontinuity is located between the lower mantle and outer core.
- The Lehmann discontinuity is located between the inner and outer core.

Step 2: Analyzing the options.
(A) P-4, Q-2, R-1, S-3: Correct — This matches the seismic discontinuities with their corresponding locations in the Earth's interior.
(B) P-4, Q-2, R-3, S-1: Incorrect.
(C) P-3, Q-2, R-4, S-1: Incorrect.
(D) P-2, Q-4, R-1, S-3: Incorrect.

Step 3: Conclusion.
The correct answer is (A) P-4, Q-2, R-1, S-3, matching the seismic discontinuities with their corresponding positions in Earth's interior.