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Geography Optional 300+ Score Pack · Model answer

Compare the Subsidence and Glacial control theories on the formation of coral reefs.

  • UPSC 2013
  • Oceanography

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Both theories answer the coral reef problem: reef-building corals grow only in warm (optimum about 23–29°C), clear, sunlit water of near-normal salinity, mostly within a few tens of metres of the surface — yet barrier reefs and atolls stand on reef limestone hundreds of metres thick and enclose lagoons of fairly even depth.

You are reading the opening of the model answer. The full answer is part of the Geography Optional 300+ Score Pack.

What the full answer covers

  • Darwin's Subsidence Theory
  • Daly's Glacial Control Theory
  • Point-by-Point Comparison
  • Testing the Theories — Drilling and Later Work
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