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Discussion

The Trewartha modification of Koppen was introduced mainly to

  • A.correct the extent of the temperate group
  • B.add a sixth major group to the scheme
  • C.remove the dry group from it entirely
  • D.base the whole system on the circulation

Answer: A

Correct answer: correct the extent of the temperate group

Trewartha’s principal complaint was that Koppen’s C group was far too broad, sweeping together climates from the Mediterranean to the humid subtropics to the cool oceanic. His modification narrowed it and introduced a separate subtropical group, using the number of months above 10 degrees as the criterion. The dry group survives, and the system remains empirical.

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