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 option gives the strongest set of evidence for seafloor spreading?

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Answer and explanation

Mapping of the ocean floor

Practice questions

01 Which option gives the strongest set of evidence for seafloor spreading?

02 What was the scientific weakness of old rope based sounding compared with modern sonar?

03 Why is oceanic crust generally not found as old as very ancient continental crust?

04 If numerous small highs are spread over an abyssal plain on a bathymetric map what conclusion is appropriate?

05 If ages of a seamount chain increase progressively in one direction what process may it indicate?

06 Which problem of Wegener's continental drift theory began to be addressed by ocean floor mapping?

07 In which situation would isobaths most clearly identify the continental slope?

08 Which option gives the correct interpretation of the deep ocean floor?

09 If bathymetric data has good vertical accuracy but wrong horizontal position what will be the main problem?

10 If a high resolution seafloor image shows broken sediments slumps and debris deposits on a slope what geohazard can be identified?

11 Thin sediment cover and high heat flow near a ridge together indicate which condition?

12 Which map evidence shows that the ocean floor is renewed over time?

13 For which two reasons is detailed mapping of shallow continental shelf especially important?

14 In which situation might a bathymetric map lead to confusion between a trench and an abyssal plain?

15 When a belt of volcanic islands occurs near a deep sea trench what is the most scientific cause?

16 If isobaths in an ocean basin form nearly circular closed lines with a shallower centre what feature is likely present?

17 On a seafloor map if a long narrow deep feature has intense earthquakes nearby which conclusion should be avoided?

18 Why can colour classification in an ocean floor map influence interpretation?

19 Why is technology like global positioning system necessary in ocean floor mapping?

20 For identifying which oceanic landform are a summit below sea level and an independent elevation important?

21 If a map shows a wedge like spread of sediments after the continental slope what zone may it be?

22 What is the greatest risk in laying submarine cables without understanding seafloor relief?

23 In which situation would direct seafloor sampling improve interpretation of mapping data?

24 Why is seafloor mapping useful for reducing natural hazard risk?

25 At expert level what is the most appropriate way to read an ocean floor map?

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