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 Mapping sediment thickness on the ocean floor can be useful in which study?

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Answer and explanation

Mapping of the ocean floor

Practice questions

01 Mapping sediment thickness on the ocean floor can be useful in which study?

02 How can the structure of the ocean floor affect the distribution of marine habitats?

03 Why is continuous measurement more useful than a single depth measurement in ocean floor mapping?

04 The combined study of trenches and ridges on the ocean floor strengthens which broad theory?

05 How should darker colours and larger depth values on a bathymetric map be interpreted?

06 Data error in ocean floor mapping can most directly affect which field?

07 What is the main advantage of sonar over the old weighted-line method?

08 In which condition will identifying the continental slope on an ocean floor map be easier?

09 What do remotely operated vehicles help with in ocean floor mapping?

10 Why is knowing ocean-floor structure useful for submarine volcanic regions?

11 In a bathymetric profile, a shallow part followed by sudden deepening away from the coast may show which sequence?

12 Why is it necessary to know bottom nature along with depth in ocean floor mapping?

13 If an isolated volcanic rise on the sea floor does not reach the surface, what is it called?

14 Why is it necessary to take the correct speed of sound in ocean floor mapping?

15 While understanding ocean-floor relief, what is the main difference between continental shelf and abyssal plain?

16 What is the importance of area coverage in ocean floor mapping?

17 How does ocean floor mapping change the idea of oceans as only water bodies?

18 Which marine feature is associated with identifying the deepest oceanic places on Earth?

19 Why is the continental rise considered less steep than the slope?

20 If a bathymetric map shows the sea floor dropping suddenly into a long narrow belt, what may it indicate?

21 What is the contribution of ocean floor mapping in planning marine protected areas?

22 How is slope understood using depth data in ocean floor mapping?

23 Similar patterns on both sides of a ridge may support which idea?

24 What is the most balanced conclusion about ocean floor mapping?

25 Why may a slight bulge appear on the sea surface above high features of the ocean floor?

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