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 Continental rise is found after which part?

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Answer and explanation

Mapping of the ocean floor

Practice questions

01 Continental rise is found after which part?

02 Why are marine sediments important for understanding ocean floor mapping?

03 The deepest parts of the ocean floor are generally linked with which feature?

04 Why is data collected repeatedly in ocean floor mapping?

05 How can ocean floor mapping help in tsunami risk studies?

06 How is the shape of the ocean floor similar to the land surface?

07 How is a deeper area generally shown on a bathymetric map?

08 Which shallow and resource-rich part of the ocean floor is this?

09 An island of volcanic origin on the ocean floor can develop from what?

10 Why are technical instruments more necessary than direct diving in ocean floor mapping?

11 What is the main role of a survey ship in ocean floor mapping?

12 How can a long rift-like valley on the ocean floor be linked with a mid-oceanic ridge?

13 Which of the following is not an ocean floor feature?

14 How is ocean floor mapping useful in environmental studies?

15 Along with depth, what else is understood in ocean floor mapping?

16 Why is sonar better than the old rope-and-weight method in ocean floor mapping?

17 For whom is depth information on marine maps most directly useful?

18 A long mountain chain found on the ocean floor belongs to which category?

19 How does ocean floor mapping help in laying submarine cables?

20 Mapping trenches and ridges on the ocean floor helps understand which natural process?

21 Which is the broad and very extensive flat plain on the ocean floor?

22 In what form can information obtained from ocean floor mapping be presented?

23 Why is understanding the ocean floor linked with Earth's internal processes?

24 What is understood from a cross profile of the ocean floor?

25 What is indicated when isobaths are close to each other?

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