Step 1: Understanding the concept.
Isostasy refers to the equilibrium that exists between the Earth's lithosphere and asthenosphere. It involves the vertical movement of the crust in response to changes in load. In continental mountain belts, this process leads to compensation, where the lithosphere adjusts to balance the weight of the mountains.
Step 2: Analyzing the options.
(A) compensation in: This is the correct answer, as isostatic compensation occurs in continental mountain belts.
(B) creation of: This is incorrect because isostasy does not create mountain belts; it adjusts the Earth's crust.
(C) destruction of: This is incorrect, as isostasy does not destroy mountain belts but helps maintain balance.
(D) thrusting in: Thrusting is a tectonic process, not directly related to isostatic compensation.
Step 3: Conclusion.
The correct answer is (A) compensation in because isostasy involves the adjustment of the Earth's crust in response to mountain formation.
A magma having density of 2900 kg m\(^-3\) just reaches the surface through a two-layered crust as shown in the figure below. Assuming isostatic equilibrium, its depth of melting is .......... km. (Round off to one decimal place) 
Match the seismic discontinuity in Group I with their occurrence in Earth's interior in Group II.
\[\begin{array}{|l|l|} \hline \textbf{Group I} & \textbf{Group II} \\ \hline \text{P. Conrad} & \text{1. Between lower mantle and outer core} \\ \hline \text{Q. Mohorovičić} & \text{2. Between crust and upper mantle} \\ \hline \text{R. Gutenberg} & \text{3. Between inner and outer core} \\ \hline \text{S. Lehmann} & \text{4. Between lower and upper crust} \\ \hline \end{array}\]
Refer to the schematic sketch given (not to scale). Assume average saturated density of oceanic crustal rocks = 3200 kg/m3, density of ocean water = 1000 kg/m3, and acceleration due to gravity = 10 m/s2. The overburden pressure at a point (P) located 2 km below seabed and 4 km below the ocean surface is ________ MPa. (Answer in integer.) 