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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 4 · 25 questions

Practice questions

01Arthur Holmes emphasized which idea to explain continental movement?

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Answer and explanation

02Oceanic trenches are generally found near which plate boundary?

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03The concept of seafloor spreading is most strongly supported by which feature?

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04Magnetic stripes on the ocean floor provide evidence of what?

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05What is considered the main source of energy for convection currents in the mantle?

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06The study of the depth and shape of the ocean floor is known as what?

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07According to seafloor spreading, where are the youngest oceanic rocks found?

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08What was an early weakness of the continental drift theory?

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09Why does hot material rise in the convectional current theory?

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10What type of feature is an abyssal plain on the ocean floor?

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11The continental slope lies between which two features?

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12Palaeomagnetism studies what?

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13Earthquakes at mid-oceanic ridges are generally of which type?

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14What depth pattern can earthquakes associated with deep oceanic trenches show?

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15In seafloor spreading, what happens to old oceanic crust?

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16Island arcs are usually related to which geological situation?

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17What is a seamount on the ocean floor?

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18What is the most distinctive feature of a guyot?

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19Detailed mapping of the ocean floor helped develop which theory?

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20What does the nearly symmetrical order of magnetic stripes on both sides of ridges show?

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21In convection currents, what does cooler and denser material generally do?

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22The idea of seafloor spreading is especially associated with which scientist?

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23Which idea best explained the problem of driving force in Wegener's theory through later studies?

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24The rising limb of a convection cell is generally most associated with which feature?

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25Which major weakness of the continental drift theory was reduced by post-drift studies?

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