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Subjects

Geography

Post-drift studies and Convectional Current Theory

In Class 11 Geography, this topic from “Distribution of Oceans and Continents” examines how later studies developed and evaluated the continental drift idea. Students review evidence such as matching coastlines, fossils, rock formations and past climates, while also considering the limitations of Wegener’s explanation. The Convectional Current Theory is introduced to explain how heat-driven currents within the mantle could move large crustal blocks and help account for the changing arrangement of oceans and continents.

Expert · Level 1 · 25 questions

Practice questions

01What was the main basis for advancing Wegener's idea in post-drift studies?

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Answer and explanation

02What was Arthur Holmes's most important contribution in Convectional Current Theory?

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03How can convection currents in the mantle affect surface plates?

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04Which conclusion was strengthened by detailed mapping of the ocean floor?

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05Why are mid-oceanic ridges linked with seafloor spreading?

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06What does the relation of oceanic trenches with subduction show?

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07How did seafloor spreading give new support to Wegener's theory?

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08What is the importance of ocean-floor age in post-drift studies?

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09What is the importance of radioactive decay in Convectional Current Theory?

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10Why is the study of global distribution of earthquakes and volcanoes useful in post-drift studies?

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11What does the combination of rising and descending currents in a convection cell show?

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12Discovery of ridges and trenches on the ocean floor gives evidence against which idea?

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13What was the main expansion of thought from Wegener to post-drift studies?

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14What is the possible relation between seafloor spreading and Convectional Current Theory?

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15What is the importance of magnetic stripes of the ocean floor in later studies?

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16Why should palaeomagnetic evidences be kept separate from Wegener's original evidences?

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17Why is mantle material understood like a slow flow in Convectional Current Theory?

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18If a ridge and new floor on both sides are found in an area which process is likely?

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19If an area shows a deep trench and frequent earthquakes what may it be linked with?

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20What was the main benefit of oceanic evidences in post-drift studies?

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21Why are both spreading and sinking possible at the surface in Convectional Current Theory?

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22Why is Arthur Holmes's idea considered complementary to Wegener's theory?

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23Which statement correctly describes the nature of post-drift studies?

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24In the context of sea-floor spreading, which age pattern of rocks on both sides of a mid-oceanic ridge is most appropriate?

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25The nearly symmetrical paleomagnetic stripes on both sides of a mid-oceanic ridge most strongly support which idea?

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