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 In ocean-floor mapping by echo sounding, why is the travel time of sound divided by two while calculating depth?

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Answer and explanation

Mapping of the ocean floor

Practice questions

01 In ocean-floor mapping by echo sounding, why is the travel time of sound divided by two while calculating depth?

02 Why is the continental shelf considered the most useful part of the ocean?

03 What is the main identifying feature of the continental slope in ocean-floor relief?

04 If a long submarine mountain chain with a central rift is found in an oceanic area, which feature does it indicate?

05 Why does mapping oceanic trenches help in understanding plate boundaries?

06 The very flat appearance of abyssal plains is mainly the result of which process?

07 Which is the most accurate difference between a seamount and a guyot?

08 In ocean-floor mapping, what are lines joining points of equal ocean depth called?

09 How did echo sounders change the older idea about the ocean floor?

10 Where is the continental shelf generally wider?

11 Why are submarine canyons considered important landforms on the continental slope?

12 What is the main advantage of multibeam mapping in ocean-floor survey?

13 If isobaths are very close together on a map, what can be inferred about that oceanic area?

14 Symmetry of magnetic stripes on both sides of a mid-oceanic ridge strengthens which explanation?

15 While mapping the age of the ocean floor, where are the youngest rocks generally found?

16 How does the spatial relation of trenches and mid-oceanic ridges explain the life cycle of oceanic crust?

17 What is the main reason for higher biological productivity on continental shelves than in deep ocean basins?

18 Which sequence correctly shows the usual relief order from coast toward deep ocean?

19 What can mapping sediment thickness on the ocean floor indicate in plate tectonics?

20 On what basis does satellite altimetry estimate the shape of the ocean floor?

21 Why is only coastal depth measurement not enough to understand the real structure of an ocean basin?

22 What is a map showing the elevations and depths of the ocean floor generally called?

23 In which situation would it be most appropriate to identify an oceanic area as an abyssal plain?

24 Why is the continental rise considered a zone between the continental slope and abyssal plain?

25 Before detailed ocean-floor mapping, which wrong belief about the ocean floor was common?

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