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 main limitation of single-beam depth sounding in ocean-floor mapping?

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Answer and explanation

Mapping of the ocean floor

Practice questions

01 What is the main limitation of single-beam depth sounding in ocean-floor mapping?

02 In multibeam bathymetry, which explanation is most correct when swath width increases?

03 What is the most likely error if a sound-speed profile is not taken in sea-floor mapping?

04 If ridge segments appear offset and joined by transverse lines on a bathymetric map, what is the most suitable conclusion?

05 What does nearly equal age on both sides at equal distance from a ridge mean in a sea-floor age map?

06 Which conclusion becomes strongest by reading magnetic stripes and rock age together?

07 Why is it necessary to check satellite-altimetry ocean maps with ship-based maps?

08 In which situation can the gravity signal of a seamount create a slight bulge on the sea surface?

09 If depth decreases inward within closed isobaths on an ocean-floor map, what does it indicate?

10 If depth increases inward within closed isobaths, which conclusion is suitable?

11 Why is mapping a submarine fan important in the study of continental rise?

12 Which feature on the ocean floor can turbidity currents help form?

13 What does the association of long linear trenches with earthquake epicentres indicate?

14 What do very closely spaced isobaths on the continental slope prove in ocean-floor mapping?

15 Why is identification of the shelf break useful on a continental shelf margin?

16 Which statement is more correct in bathymetric comparison of active and passive continental margins?

17 What historical process can a flat-topped submerged volcanic mountain show?

18 What can be the most scientific meaning of an age-progressive seamount chain?

19 Which clue is decisive in distinguishing an oceanic plateau from a normal abyssal plain?

20 What can sediment-layer thickness in a seismic reflection profile indicate about sea-floor development?

21 Dominance of basalt in oceanic crust samples supports which interpretation in ocean-floor mapping?

22 The occurrence of pillow lava indicates which environment on the ocean floor?

23 Why is mapping hydrothermal vents important in the study of mid-oceanic ridges?

24 Why is it necessary to read calcareous ooze distribution with depth?

25 Where is greater thickness of terrigenous sediments more likely in marine areas?

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