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Geography

Continental Drift Theory and its evidence

In Class 11 Geography, this topic explains the Continental Drift Theory within the chapter “Distribution of Oceans and Continents.” Students learn Alfred Wegener’s idea that the continents were once joined as Pangaea and gradually moved apart. They examine evidence such as the matching shapes of coastlines, similar fossils, continuous rock formations, mountain belts, and past glacial deposits found on continents now far apart. The topic also introduces the theory’s limitations and its importance in the later development of plate tectonics.

Hard · Level 3 · 25 questions

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  1. Because shelf margins better show the real edge of landmass than coastlines
  2. Because shelf margins form only by rivers
  3. Because coastlines never change
  4. Because oceans have no shelf
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  1. It explains coastline rock fossil and climatic similarities through an old joined landmass
  2. It explains only present rainfall
  3. It considers oceans fixed
  4. It considers continents formed in one day
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  1. There may have been geological continuity across both margins
  2. Both continents have the same language today
  3. The Atlantic was once a river
  4. All rocks are marine fossils
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  1. Because its occurrence on distant continents is not easily explained by long ocean crossing
  2. Because it was a modern bird
  3. Because it was a tidal force
  4. Because it was found only in Panthalassa
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  1. They indicate old biological and climatic relation of southern landmasses
  2. They are only evidence of modern cities
  3. They show the depth of Panthalassa
  4. They prove pole fleeing force
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  1. Old glacial areas may have spread over a joined southern landmass
  2. All southern continents are joined today
  3. Glaciers formed only in deserts
  4. Tillite is water of Panthalassa
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  1. It indicates old glacier flow and former positions of continents
  2. It shows modern railway routes
  3. It measures speed of tidal force
  4. It changes the size of Pangaea
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  1. As a clue of old warm vegetated environment in a presently cold region
  2. As present glacial rainfall
  3. As evidence of ocean salinity
  4. As expansion of Panthalassa
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  1. Similarity of mineral sources may indicate old land connection
  2. Gold forms only from glaciers
  3. Gold dries oceans
  4. Placer deposits are fossil plants
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  1. It was not considered powerful enough to move continents
  2. It was not linked with Earth's rotation at all
  3. It was made of fossils
  4. It was part of Tethys Sea
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  1. It was based on Sun Moon attraction but considered insufficient for continental movement
  2. It was based on river flow and fully proved
  3. It was based on vegetation and made fossils
  4. It was based on cities and changed weather
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  1. Because ocean floor was considered a resistant solid medium
  2. Because oceans were made only of air
  3. Because continents had no density
  4. Because fossils are not found in seas
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  1. It explained continental movement mechanism through plate motion
  2. It proved Pangaea to be a fossil
  3. It removed coastline evidence
  4. It called all continents fixed
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  1. It gave a basis to understand ocean floor as mobile
  2. It called Pangaea a small island
  3. It made fossil evidence wrong
  4. It called all plates fixed
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  1. Continental blocks have been mobile over long time
  2. India was always part of Europe
  3. India was water of Panthalassa
  4. India has no geological history
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  1. Because modern explanation is based on plate motion and collision mechanism
  2. Because Himalaya is man made
  3. Because India never moved
  4. Because Eurasia is an ocean
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  1. Background of later collision and mountain building
  2. Modern urban traffic
  3. Salinity of Panthalassa
  4. Flight of Mesosaurus
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  1. Understanding them as directional and geological divisions of Pangaea
  2. Memorising them as modern cities
  3. Taking them as river systems
  4. Considering them names of tidal forces
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  1. Because visual and biological independent clues both support old connection
  2. Because both show present weather
  3. Because both show similarity of cities
  4. Because both measure tide height
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  1. Because a hypothesis becomes stronger when different sources give similar conclusion
  2. Because both depend on only one organism
  3. Because both are related to politics
  4. Because both show present market
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  1. It is wrong because Panthalassa was the ocean surrounding Pangaea
  2. It is correct because Panthalassa was Glossopteris
  3. It is correct because Panthalassa is tillite
  4. It is wrong because Panthalassa is a modern city
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  1. Glossopteris fossils tillite and southern glacial marks
  2. Modern roads markets and language
  3. Panthalassa Tethys and tidal force
  4. Present cities population and industry
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  1. When the same region also shows similar rock and fossil evidence
  2. When only map colour is similar
  3. When present language is similar
  4. When number of cities is similar
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  1. Wegener gave evidences but plate tectonics gave a stronger movement mechanism
  2. Wegener accepted no continents
  3. Plate tectonics explains only weather
  4. There is no relation between them
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  1. Understanding former climatic positions of landmasses from old glacial and coal clues
  2. Making Pangaea from today's rain
  3. Making fossils from present temperature
  4. Proving tidal force from river flow

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