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SSC Geography QUESTION #6295
Question 1
Which of the following best explains the relationship between isostasy and mountain building in the context of plate tectonics?
  • Isostatic equilibrium prevents mountains from exceeding 8000m in height
  • Mountain roots extend deep into the mantle to maintain isostatic balance, with depth proportional to elevation✔️
  • Isostasy only applies to oceanic crust, not continental mountain ranges
  • Mountain building disrupts isostasy permanently until erosion occurs
Correct Answer Explanation
Isostasy describes the gravitational equilibrium between Earth's lithosphere and asthenosphere. Mountains have deep crustal roots (like icebergs) extending into the mantle to maintain balance - the Airy hypothesis of isostatic compensation. The greater the elevation, the deeper the root, maintaining equilibrium.