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 a seafloor map shows rock age increasing on both sides away from a mid oceanic ridge what is the most accurate interpretation?

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Answer and explanation

Mapping of the ocean floor

Practice questions

01 If a seafloor map shows rock age increasing on both sides away from a mid oceanic ridge what is the most accurate interpretation?

02 If the two way travel time of a sound signal doubles while sound speed in water remains constant what happens mathematically to depth?

03 Which map evidence can show that an oceanic trench is not merely deep but also a plate boundary?

04 On a bathymetric map if isobaths are widely spaced on a ridge top but closely spaced on its flank what does it mean?

05 If fracture zones are seen cutting a ridge into segments on a detailed seafloor map what is their main significance?

06 If sediment thickness is low near a ridge and greater farther away what conclusion is most appropriate?

07 Satellite altimetry does not directly see the seafloor yet how does it indicate ridges and seamounts?

08 In which situation would multibeam sonar seafloor shape be more reliable than single point depth sounding?

09 What scientific idea is supported by identical sequence of magnetic stripes on both sides of a ridge?

10 Why can identifying the shelf break at the edge of the continental shelf be difficult?

11 Which map pattern is more likely to identify a passive continental margin?

12 If a submerged mountain has a flat top and deep floor around it what does it indicate about its earlier stage?

13 Why are deep sea fans generally located at the base of the continental slope?

14 Why are temperature salinity and pressure included in ocean depth measurement?

15 Which oceanic feature suggests that two plates are moving apart?

16 If heat flow decreases away from a ridge on an ocean floor map what is the scientific meaning?

17 Why may abyssal plains have an irregular rocky basement even though they appear extremely flat?

18 On a seafloor map if volcanic islands lie landward and a trench lies oceanward of an island arc what plate process is indicated?

19 Which statement shows that bathymetry is not merely a collection of depths?

20 If a marine area is surveyed only along ship tracks and gaps remain between them what error may occur in the map?

21 What can be one reason for relatively low sediment accumulation in oceanic trenches?

22 The global distribution of mid oceanic ridges reflects which deep Earth process?

23 Why can seafloor mapping help in the study of ocean circulation?

24 If a deep V shaped submerged canyon appears on the continental slope what may it indicate?

25 The presence of a linear trench parallel to an island arc on an ocean floor map is advanced evidence of what?

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