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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.

Medium · Level 5 · 25 questions

Practice questions

01Evidence like changing positions of magnetic poles made which study important?

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02What did post-drift studies do instead of directly rejecting Wegener's idea?

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03What role is assigned to radioactive elements in Convectional Current Theory?

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04In which condition can a convection cell push plates away from each other?

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05Where is new crust most likely to form during sea-floor spreading?

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06How does the age of rocks generally change away from a mid-oceanic ridge?

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07What conclusion about Earth's crust comes from studying sea-floor spreading and subduction together?

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08Which foundation for Plate Tectonics was prepared by post-drift studies?

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09What is generally included in a lithospheric plate?

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10If two oceanic plates are moving apart, which feature is more likely to form?

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11If two plates move toward each other, which process is likely?

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12In what way was Convectional Current Theory considered more useful than Wegener's theory?

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13After post-drift studies, the idea of continental drift became part of which larger theory?

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14Why are magnetic stripes on the ocean floor found symmetrically on both sides of mid-oceanic ridges?

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15Sea-floor spreading theory reduced which problem in Wegener's explanation?

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16Why do earthquakes occur more frequently along plate boundaries?

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17The relation of volcanic activity with plate boundaries strengthens which idea?

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18How can the cyclic movement of material in convection current be understood correctly?

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19Why did scientists in post-drift studies not consider ocean floors as merely empty water areas?

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20What was the main difference between the ideas of Alfred Wegener and Arthur Holmes?

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21According to sea-floor spreading, why does sediment thickness generally increase away from a mid-oceanic ridge?

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22The idea of sea-floor spreading is commonly associated with which scientist?

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23What was the role of Convectional Current Theory in the development of Plate Tectonics?

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24If earthquakes, volcanoes, and mountain building occur together in an area, what may it indicate?

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25What is the role of magma in understanding sea-floor spreading?

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