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Geography

Continental Drift Theory and its evidence

In Class 11 Geography, this topic explains the Continental Drift Theory within the chapter “Distribution of Oceans and Continents.” Students learn Alfred Wegener’s idea that the continents were once joined as Pangaea and gradually moved apart. They examine evidence such as the matching shapes of coastlines, similar fossils, continuous rock formations, mountain belts, and past glacial deposits found on continents now far apart. The topic also introduces the theory’s limitations and its importance in the later development of plate tectonics.

Expert · Level 5 · 25 questions

Practice questions

01Which theoretical basis is most essential to understand the present position of continents in Wegener's theory?

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Answer and explanation

02Why does matching continental margins make Pangaea reconstruction more logical?

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03Why is matching continental shelves more reliable than matching shorelines?

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04What was the significance of the huge water body surrounding Pangaea according to Wegener?

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05The position of the Tethys Sea between Laurasia and Gondwanaland is useful in which explanation?

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06Which conclusion becomes strongest from similar glacial deposits in Gondwana landmasses?

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07What does the similar direction of ancient glacial striations prove?

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08Why is the distribution of Mesosaurus fossils especially effective in support of Wegener?

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09Finding Glossopteris fossils in different southern landmasses strengthens which idea?

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10Why does evidence of similar rock age and rock structure have decisive importance?

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11How should similarity of mineral deposits be interpreted in Wegener's theory?

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12What role did Wegener assign to pole-fleeing force?

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13Which is the most correct reason for criticism of tidal force?

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14Why is Wegener's theory called evidence-rich but mechanism-weak?

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15Why was there an objection to the idea of continents ploughing through sima?

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16In Wegener's idea the difference between sial and sima was related to what?

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17In Wegener's theory breakup of Pangaea was considered the beginning of which process?

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18India's relation with Gondwanaland is most supported by which evidences?

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19If a region has present warm climate but ancient glacial evidence is found there what is the most suitable explanation?

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20When does the strength of fossil evidence become highest in Wegener's theory?

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21Why was Wegener's explanation more revolutionary than the land bridge idea?

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22How did Arthur Holmes's convection current hypothesis help the idea of continental drift?

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23How did seafloor spreading later strengthen Wegener's basic idea?

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24What is the most correct relation of palaeomagnetic evidence with Wegener's theory?

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25What foundation did Wegener's idea provide for the development of plate tectonics?

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