Geomorphology-Continental Drift [IAS (Admin.) Mains Geography]: Questions 1 - 4 of 4

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Question 1

Describe in Detail Subjective▾

Explain the idea of sea Floor spreading as propounded by Harry Hess and the evidences in support of it.

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Explanation

Idea of Sea Floor Spreading

  • Professor Harry Hess of the Princeton University first propounded the concept of sea floor spreading in 1960.
  • Mapping of the ocean floor & observations of the distribution of earthquakes & volcanoes led to the theory of sea floor spreading.
  • Conventional current theory propounded by Arthur Holmes in 1930 is the basis of sea …

… (304 more words, 6 figures) …

Question 2

Describe in Detail Subjective▾

Highlighting the shortcomings of Continental Drift Theory, explain how plate Tectonics emerged as a much widely accepted theory? (15 marks) (Examrace Test Series 2017)

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Explanation

Continental Drift Theory

  • Continental drift theory was the first comprehensive theory of non-permanence of earth.
  • It was given by Alfred Wegener (1912) here are some major shortcomings like-
    1. He described the pole fleeing and tidal forces as the cause of movement (Scientifically proven it is not possible) .
    2. Explained that continental landmass (SIAL) floa…

… (199 more words, 11 figures) …

Question 3

Describe in Detail Subjective▾

Explain how Wegner՚s theory was the pioneer in formation of continents? Support you answer with the fact that Wegner՚s theory was superseded by plate tectonics and sea floor spreading (Marks 25)

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Explanation

Wegener՚s Theory

  • The “Continental Theory of Wegner” grew out of the need of explaining the major variations of climate in the past.
  • Wegner opted for second alternative i.e.. the climatic zones remained stationary & the landmasses might have been displaced & drifted.
  • Following Edward Suess, he believed that the outer layer of “sial” / continents were f…

… (507 more words, 51 figures) …

Question 4

Describe in Detail Subjective▾

Discuss the limitations of the theory of Continental Drift and show how the theory of Plate Tectonics is an improvement over it.

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Explanation

Wegner took inspiration from the map of continents to explain the earth՚s geologic history. But his hypothesis stemmed from his inability to provide following measures:

Described pole fleeing force and tidal force as cause of movement. Both were scientifically proven as to small to aid movement.

Explained that continental landmass (SIAL) floats freel…

… (504 more words, 4 figures) …