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 If isobath lines are very close to each other, what kind of sea-floor slope is indicated?

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Answer and explanation

Mapping of the ocean floor

Practice questions

01 If isobath lines are very close to each other, what kind of sea-floor slope is indicated?

02 Why is detailed mapping of the continental shelf economically important?

03 On an ocean-floor map, the bend of a volcanic island chain may give information about what?

04 Why may a heat-flow map of the ocean floor generally show higher values near ridges?

05 Why does a map of oceanic crust age look very different from continental crust age?

06 In an oceanic map, a long raised belt cutting across an ocean basin indicates which feature?

07 In sea-floor mapping, gravity anomalies help infer which hidden features?

08 How can incomplete ocean-floor mapping affect scientific conclusions?

09 On an ocean-floor map, a trench near an island arc may indicate which plate process?

10 Why is ocean-floor mapping necessary in planning submarine cables and pipelines?

11 In deep sea flat plains, fine sediment layers may come from which source?

12 In an ocean-floor map, the continental rise is considered to lie between which parts?

13 Which improvement is useful for reducing error in ship-based ocean-floor surveys?

14 If a rift valley appears at the centre of an oceanic ridge on a map, what process does it indicate?

15 Why is it necessary to use the correct speed of sound in ocean-floor mapping?

16 Why are older oceanic rocks generally found farther from ridges on sea-floor maps?

17 What may be a limitation of pressure-based depth measurement in ocean-floor mapping?

18 The increasing use of autonomous vehicles and robots in ocean-floor mapping addresses which limitation?

19 If a map shows a long ridge in an ocean basin and similar magnetic stripes on both sides, what is the best explanation?

20 On an ocean-floor map, a vast shallow area with very gentle slope may be more favourable for which human use?

21 What can still be considered a major challenge in global ocean-floor mapping?

22 How can ocean-floor mapping be useful in marine biodiversity conservation?

23 On a map, a seamount remaining below sea level and not forming an island may depend on what?

24 Why is knowing slope direction on an ocean-floor map important for sediment flow?

25 Why can ocean-floor mapping be called a bridge between continental drift and plate tectonics?

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