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 What is the scientific and economic importance of regional mapping of manganese nodules?

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Answer and explanation

Mapping of the ocean floor

Practice questions

01 What is the scientific and economic importance of regional mapping of manganese nodules?

02 What is the biggest advantage of using dredge samples and sonar data together in ocean-floor mapping?

03 For which expert purpose is a remotely operated vehicle most suitable on the sea floor?

04 Why is a high-resolution floor map prepared before laying undersea cables?

05 Marks of large submarine landslides on the sea floor help in studying which risk?

06 What caution is necessary while using vertical exaggeration in a bathymetric profile?

07 Why can small landforms be smoothed out during data gridding in ocean-floor mapping?

08 Repeated survey tracks in sea-floor surveying help in which quality check?

09 If high heat flow, a rift valley and young basalt are found in a marine area, what is the most correct interpretation?

10 What geological condition is indicated by an island arc occurring with a trench on an ocean-floor map?

11 Which evidence is stronger than only matching continental outlines for explaining sea-floor spreading?

12 What is the importance of small abyssal hills despite the great flatness of abyssal plains on sea-floor maps?

13 What can be a main reason for difference between real floor and mapped floor in ocean-floor mapping?

14 Why can older oceanic crust have more sediment and lower heat flow?

15 Why is it incomplete to treat oceanic trenches only as maximum-depth zones?

16 What is the main difference in purpose between a navigation chart and a scientific bathymetric map?

17 A very wide flat shelf and thick land-derived sediments on a sea-floor map indicate which environment?

18 What does the combination of a narrow shelf, steep slope and nearby trench at an active margin indicate?

19 What may happen if water-level correction is not applied in sea-floor mapping?

20 Why is correcting angular deviation of sound beams necessary in multibeam mapping?

21 Which technique is more suitable for imaging fine scratches and linear marks on the sea floor?

22 Detecting hydrothermal metallic deposits on the sea floor connects which two objectives?

23 What is the main advantage of combining depth, magnetism and earthquake data in ocean-floor mapping?

24 How does detailed mapping of the ocean floor address weaknesses of continental drift?

25 Which conclusion best expresses the overall importance of ocean-floor mapping?

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