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 Why is heat flow generally higher at mid-oceanic ridges?

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Answer and explanation

Mapping of the ocean floor

Practice questions

01 Why is heat flow generally higher at mid-oceanic ridges?

02 Which feature helps distinguish an oceanic trench from an abyssal plain?

03 Why are sound waves more useful than light in ocean-floor mapping?

04 If submerged volcanic cones are found around an oceanic island, which landform are they most related to?

05 A sudden very deep drop on a sea-floor map may indicate which landform?

06 Why is mapping the ocean floor important for navigation?

07 What difference is generally found between continental shelf and oceanic basin rocks?

08 The occurrence of hydrothermal vents on the sea floor is most closely associated with which area?

09 For what purpose is a longitudinal profile used in ocean-floor mapping?

10 Which difference between an oceanic ridge and a land mountain range is correct?

11 What is the most suitable tectonic reason for many trenches around the Pacific Ocean margins?

12 If sea-floor samples become older away from a ridge, what conclusion follows?

13 What additional understanding is gained by studying both depth and sediments in ocean-floor mapping?

14 Which landform is counted among Earth's longest mountain systems but lies underwater?

15 Why does ocean-floor mapping help in identifying seismic zones?

16 Why is the presence of the mid-ocean ridge in the Atlantic important for ocean spreading?

17 Why is position fixing necessary along with depth measurement in ocean-floor mapping?

18 Which option correctly matches a sea-floor feature with its related process?

19 If isobaths are far apart and depth is nearly uniform in a marine area, what landform would it resemble?

20 What is the advantage of using sampling and sound measurement together in ocean-floor mapping?

21 Sudden downslope movement of sediments on the continental slope may be linked with which type of flow?

22 What is the importance of magnetic reversals in mapping sea-floor spreading?

23 Which statement is most correct about the major parts of the ocean floor?

24 The association of island arcs with deep trenches on the sea floor indicates which condition?

25 Which evidence from ocean-floor mapping most strongly supports later explanations of continental drift?

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