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Subjects

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.

TOPIC PRACTICE

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Hard · Level 2
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  1. Because new and hot oceanic crust forms there
  2. Because maximum river water enters there
  3. Because glaciers accumulate there
  4. Because solar heat directly reaches the sea floor there
Hard · Level 2
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  1. A trench is a broad flat surface
  2. A trench is a narrow, long and extremely deep depression
  3. A trench is always a shallow coastal part
  4. A trench is only a flat-topped mountain
Hard · Level 2
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  1. Because light always travels faster in seawater
  2. Because sound can travel effectively over long distances in water
  3. Because sound does not need water
  4. Because light forms sea-floor rocks
Hard · Level 2
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  1. Continental shelf
  2. Abyssal plain
  3. Seamounts
  4. Oceanic trenches
Hard · Level 2
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  1. Continental shelf
  2. Oceanic trench
  3. Flat abyssal plain
  4. Coral island
Hard · Level 2
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  1. It helps ships avoid shallow or dangerous undersea features
  2. It makes weather permanent at sea
  3. It makes sea salinity zero
  4. It makes ships move without wind
Hard · Level 2
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  1. Shelf has only deep oceanic basaltic crust
  2. Shelf is shallow part attached to continental margin while ocean basin may be deeper with basaltic crust
  3. There is no depth difference between them
  4. Oceanic basin is always made of river sand
Hard · Level 2
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  1. Continental shelf
  2. River delta
  3. Mid-oceanic ridge
  4. Coastline
Hard · Level 2
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  1. To show change in sea-floor depth with distance
  2. To show cloud movement over the ocean
  3. To show population of coastal cities
  4. To list names of sea fish
Hard · Level 2
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  1. Ridge forms only by river erosion
  2. Oceanic ridge is a long raised chain on sea floor and may be linked with plate spreading
  3. Land mountains are always under the sea
  4. Ridge is always smaller than continental shelf
Hard · Level 2
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  1. Passive margins dominate there
  2. Subduction and convergent plate boundaries are widespread there
  3. All continents are moving away there and there is no boundary
  4. Only river deltas form there
Hard · Level 2
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  1. Sea-floor spreading is supported
  2. Abyssal plains are disappearing
  3. Ocean water has become vapour
  4. Shelf is the youngest part
Hard · Level 2
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  1. Only weather prediction
  2. Indication of origin of landforms and relative age of crust
  3. Permanence of sea-water colour
  4. Direct measurement of river length
Hard · Level 2
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  1. Continental shelf
  2. Oceanic trench
  3. Mid-oceanic ridge
  4. Continental rise
Hard · Level 2
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  1. Because trenches, ridges and fault zones may be linked with plate boundaries
  2. Because earthquakes occur only in rivers
  3. Because there are no plates on the sea floor
  4. Because mapping stops waves
Hard · Level 2
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  1. It indicates a spreading centre near the middle of the ocean
  2. It proves that the ocean has no crust
  3. It is only a pile of coastal sand
  4. It removes all trenches
Hard · Level 2
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  1. So each depth can be placed at the correct geographic location
  2. So sound does not enter water
  3. So the ocean dries up
  4. So isobaths disappear
Hard · Level 2
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  1. Oceanic trench and subduction
  2. Shelf and sea-floor spreading
  3. Guyot and river deposition
  4. Abyssal plain and mountain building
Hard · Level 2
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  1. Oceanic trench
  2. Abyssal plain
  3. Continental slope
  4. Submarine canyon
Hard · Level 2
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  1. One gives depth and the other gives information about bottom material
  2. Both measure only sea breeze
  3. Both tell the language of fish
  4. Both make the ocean stationary
Hard · Level 2
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  1. Salinity-free flow
  2. Turbidity current
  3. Atmospheric jet stream
  4. Glacial melt flow
Hard · Level 2
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  1. They create symmetrical bands on the sea floor that record spreading
  2. They make sea water fresh
  3. They show only coastal temperature
  4. They turn trenches into shelves
Hard · Level 2
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  1. Ocean floor has only shelf and coastline
  2. Ocean floor includes shelf, slope, abyssal plains, ridges and trenches
  3. No sediment is found on the ocean floor
  4. Ocean floor is made only of continental rocks
Hard · Level 2
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  1. Passive coast and low seismicity
  2. Subduction zone and active plate boundary
  3. Flat abyssal plain and zero slope
  4. River deposition on shelf
Hard · Level 2
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  1. Ridges, magnetic stripes and crust-age pattern on the sea floor
  2. Only colour of sand on coasts
  3. Amount of water in rivers
  4. Seasonal change in air pressure

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