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 How is ocean floor mapping useful for navigation safety?

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Answer and explanation

Mapping of the ocean floor

Practice questions

01 How is ocean floor mapping useful for navigation safety?

02 Why are deep trenches more likely in front of active continental margins than passive margins?

03 If an oceanic map shows a very wide shelf what general condition may it be linked with?

04 Which mapping evidence helps show that oceanic crust is generally younger than continental crust?

05 Mapping submarine canyons on the continental slope can give information about which process?

06 Why is correct knowledge of sound speed necessary in ocean floor mapping?

07 Hydrothermal vents on the ocean floor are more commonly associated with which feature?

08 Which option gives the general order of major ocean floor parts from coast toward the open ocean?

09 Mapping of widespread abyssal hills on the seafloor clarifies what?

10 How does a high resolution map of the ocean floor help identify submarine landslides?

11 Mapping an earthquake belt near a deep sea trench indicates which tectonic condition?

12 Ocean floor exploration disproved which older idea about oceans?

13 In which situation would seafloor depth measurement need the greatest correction?

14 Why is similarity of parallel magnetic stripes on both sides of a ridge important in an ocean floor map?

15 Why is a grid based survey used in mapping the ocean floor?

16 Mapping long fractures and faults on the seafloor gives what type of information?

17 Mapping which oceanic feature relates to both origin of new crust and heat flow?

18 On an ocean floor map a deep trench parallel to an island arc indicates what relationship?

19 Which statement best describes the relation between ocean floor mapping and plate tectonics?

20 If a conical high submerged mountain suddenly appears on an abyssal plain what is it called?

21 What can be the major effect of data gaps in ocean floor mapping?

22 What is the greatest topographic difference between continental shelf and abyssal plain?

23 Why can detailed maps of the ocean floor also be useful in climate studies?

24 If a seafloor map shows a large smooth equal depth area with nearby small highs what is the interpretation?

25 Why is mapping the ocean floor not only depth measurement but also geological interpretation?

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