Geography

Mapping of the ocean floor

महासागर तल का मानचित्रण

In this Class 11 Geography topic from “Distribution of Oceans and Continents,” students learn how the ocean floor is mapped and interpreted. They explore major features such as continental shelves, slopes, deep-sea plains, mid-ocean ridges, trenches and seamounts, and understand how soundings, sonar and bathymetric maps reveal underwater relief. The topic also helps connect ocean-floor patterns with plate boundaries, seafloor spreading and the changing distribution of continents and oceans.

Practice questions

01 Which main limitation of the old rope sounding method was removed by echo sounding in ocean floor mapping?

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Answer and explanation

Mapping of the ocean floor

Practice questions

01 Which main limitation of the old rope sounding method was removed by echo sounding in ocean floor mapping?

02 If depth suddenly increases rapidly away from a continental margin which feature is most likely present?

03 In a contour map of the ocean floor closely spaced depth contours indicate what condition?

04 Mapping of mid oceanic ridges provided which most important clue for plate tectonics?

05 Deep oceanic trenches are generally found near which plate boundaries?

06 Why are abyssal plains considered among the flattest parts of the ocean floor?

07 Which feature has a flat top indicating that it was once affected by erosion near sea level?

08 Mapping of magnetic stripes on the ocean floor strengthens which explanation?

09 In sound wave based ocean mapping if the signal takes more time to return what does it directly mean?

10 Why is mapping the continental shelf important in economic geography?

11 What is the basic purpose of bathymetry in mapping the ocean floor?

12 If a map shows a long rift like valley along the middle of a ridge it may be linked with which process?

13 Why were older maps of the ocean floor more incomplete?

14 Mapping sediment thickness in ocean basins helps in which conclusion?

15 The continental rise is generally understood as a transition zone between which features?

16 How does satellite altimetry indirectly help in mapping the ocean floor?

17 Which pair correctly represents the depth arrangement of ocean floor features?

18 What is the most decisive difference between a seamount and a guyot?

19 What is the global network of long mountain chains on the ocean floor called?

20 A narrow and very deep linear depression on a seafloor map is the identity of which feature?

21 Why is multibeam sonar better than single beam sonar in ocean floor mapping?

22 Mapping of the ocean floor later helped reduce which weakness of the continental drift theory?

23 Which part of the seafloor generally becomes older with increasing distance from the mid oceanic ridge?

24 If a fan shaped sedimentary form is found at the base of a slope on the seafloor it may be related to what?

25 What is the line joining points of equal depth on a bathymetric contour map called?

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