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 Why are the ship's speed and direction recorded accurately during depth measurement?

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Answer and explanation

Mapping of the ocean floor

Practice questions

01 Why are the ship's speed and direction recorded accurately during depth measurement?

02 What does high resolution mean in ocean-floor mapping?

03 Thick terrigenous sediments on the ocean floor are most closely related to which source?

04 What is the significance of calcareous ooze distribution in ocean-floor mapping?

05 Why may sediment quantity be low in many oceanic trenches?

06 Mapping of a rift valley on the ocean floor is related to which major location?

07 Why can rock ages be similar at equal distances on both sides of a ridge in a sea-floor spreading map?

08 What does finding basaltic samples on the ocean floor indicate about oceanic crust?

09 For what is dredging used in ocean-floor mapping?

10 What is the advantage of remotely operated vehicles in ocean-floor mapping?

11 Which clue is useful for identifying the continental rise on a sea-floor map?

12 What is the economic importance of mapping manganese nodules on abyssal plains?

13 Why are hydrothermal deposits on the sea floor especially important?

14 Which map clue most directly indicates steepness of the continental slope?

15 If transverse lines cut ridge segments on an ocean-floor map, what may they be related to?

16 Why are repeated surveys of the same area done for error checking in ocean-floor mapping?

17 Why is vertical exaggeration used in bathymetric profiles?

18 Why is identifying remains of giant submarine landslides important?

19 How do ocean-floor mapping techniques fill a gap in continental drift theory?

20 Why can actual depth and charted depth differ in ocean-floor mapping?

21 Identification of pillow lava on the ocean floor is linked with which process?

22 What is understood by reading sea-floor depth together with earthquake epicentre distribution?

23 How can mapping the continental shelf indicate sea-level change?

24 Why is correcting the sound beam angle important in ocean-floor mapping?

25 Which conclusion correctly connects both physical and economic uses of ocean-floor mapping?

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