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Class 11 Humanities (Arts)

Geography – Fundamentals of Physical Geography

Distribution of Oceans and Continents

Distribution of Oceans and Continents

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Study Action Plan (Sorted by Difficulty)
Continental Drift Theory
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Convectional Current Theory
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Distribution of Earthquakes and Volcanoes
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Movement of the Indian Plate
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Ocean Floor Configuration
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Plate Tectonics
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Sea Floor Spreading
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High

Learning Objectives

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Learning Objectives

  • Understand the Continental Drift Theory proposed by Alfred Wegener, including the concept of Pangaea and the evidence supporting this theory such as the jigsaw fit of continents, matching geological formations, and fossil distribution.
  • Explain the process of Sea Floor Spreading as proposed by Harry Hess, including the formation of new oceanic crust at mid-ocean ridges and its implications for continental movement and oceanic features.
  • Describe the Plate Tectonics theory, detailing the movement of Earth's lithospheric plates and how this explains the distribution of continents, oceanic trenches, and mountain ranges.
  • Analyze the Convectional Current Theory by Arthur Holmes, focusing on how mantle convection currents driven by radioactive decay contribute to tectonic plate movement.
  • Identify the patterns in the Distribution of Earthquakes and Volcanoes, particularly in relation to tectonic boundaries such as mid-ocean ridges and the Pacific Ring of Fire.
  • Examine the Ocean Floor Configuration, including continental margins, abyssal plains, and mid-ocean ridges, to understand their role in plate tectonics.
  • Trace the Movement of the Indian Plate from its original position near the Australian coast to its collision with the Eurasian Plate, leading to the uplift of the Himalayas.

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Revision Notes & Summary

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Chapter Notes

Continental Drift Theory

  • Proposed by Alfred Wegener in 1912, suggesting that continents were once a single landmass, Pangaea, and have drifted apart over time.
  • Evidence:
    • Jigsaw Fit: The coastlines of Africa and South America fit together.
    • Rocks of Same Age: Similar rock formations found across continents.
    • Tillite: Glacial deposits found in multiple continents suggesting past connections.
    • Placer Deposits: Gold deposits in Ghana with source rocks in Brazil.
    • Fossil Distribution: Identical species found on separate continents.

Sea Floor Spreading

  • Proposed by Harry Hess in 1961.
  • Process: New oceanic crust forms at mid-ocean ridges and spreads outward.
  • Evidence:
    • Volcanic eruptions at mid-oceanic ridges.
    • Symmetrical magnetic stripes on either side of ridges.
    • Younger oceanic crust compared to continental crust.
    • Thin sediment layers on the ocean floor.

Plate Tectonics

  • Theory describing the motion of Earth's lithosphere.
  • Plates: Seven major and several minor plates.
  • Boundaries:
    • Divergent: Plates move apart (e.g., Mid-Atlantic Ridge).
    • Convergent: Plates collide, leading to subduction zones.
    • Transform: Plates slide past each other horizontally.

Convectional Current Theory

  • Proposed by Arthur Holmes in the 1930s.
  • Mechanism: Convection currents in the mantle, driven by heat from radioactive decay, move tectonic plates.

Distribution of Earthquakes and Volcanoes

  • Patterns:
    • Concentrated along tectonic boundaries.
    • Mid-ocean ridges and the Pacific Ring of Fire are significant zones.

Ocean Floor Configuration

  • Components:
    • Continental Margins: Transition zones between continents and ocean basins.
    • Abyssal Plains: Flat areas between continental margins and mid-ocean ridges.
    • Mid-Oceanic Ridges: Submerged mountain chains with volcanic activity.

Movement of the Indian Plate

  • Northward movement from near the Australian coast.
  • Collision with the Eurasian Plate led to the uplift of the Himalayas.
  • Historical Positions: Moved from 50°S latitude to current position over millions of years.
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Practice Test – MCQs, True/False

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Multiple Choice Questions

A.

Presence of similar fossils across continents

B.

Matching coastlines of continents

C.

Glacial tillite deposits

D.

Distribution of earthquakes
Correct Answer: C

Solution:

Glacial tillite deposits found in various continents indicate that these landmasses were once part of a single large landmass, supporting the theory of continental drift.

Chapter Concept:

Plate Tectonics

A.

It describes the movement of continents over the ocean floor.

B.

It involves the creation of new oceanic crust at mid-oceanic ridges and its destruction at oceanic trenches.

C.

It refers to the horizontal sliding of tectonic plates past each other.

D.

It is the process of sediment accumulation on the ocean floor.
Correct Answer: B

Solution:

Sea floor spreading involves the creation of new oceanic crust at mid-oceanic ridges, which then spreads outwards and is eventually consumed at oceanic trenches.

Chapter Concept:

Distribution of Earthquakes and Volcanoes

A.

Continental Drift Theory

B.

Plate Tectonics

C.

Sea Floor Spreading

D.

Convectional Current Theory
Correct Answer: B

Solution:

Plate Tectonics is the theory that explains the large-scale motion of the Earth's lithosphere plates.

Chapter Concept:

Plate Tectonics

A.

Pacific Ring of Fire

B.

Alpine-Himalayan Belt

C.

Mid-Atlantic Ridge

D.

Java Trench
Correct Answer: C

Solution:

The mid-oceanic ridges, such as the Mid-Atlantic Ridge, are characterized by shallow earthquake foci due to tectonic activity related to sea floor spreading.

Chapter Concept:

Distribution of Earthquakes and Volcanoes

A.

Gravitational pull

B.

Pole-fleeing force and tidal force

C.

Magnetic force

D.

Centrifugal force
Correct Answer: B

Solution:

Wegener suggested that the pole-fleeing force and tidal force were responsible for the drifting of continents.

Chapter Concept:

Continental Drift Theory

A.

Mid-oceanic ridges

B.

Deep-oceanic trenches

C.

Abyssal plains

D.

Continental shelves
Correct Answer: B

Solution:

Deep-oceanic trenches are associated with the subduction of oceanic crust as it sinks into the mantle.

Chapter Concept:

Plate Tectonics

A.

Convection currents

B.

Tidal force

C.

Gravitational pull

D.

Magnetic force
Correct Answer: B

Solution:

Wegener proposed tidal force as a mechanism for continental drift, but it was later considered insufficient to account for the movement of continents.

Chapter Concept:

Plate Tectonics

A.

Presence of mid-oceanic ridges

B.

Convergent plate boundaries

C.

Transform plate boundaries

D.

Divergent plate boundaries
Correct Answer: B

Solution:

The 'Ring of Fire' is primarily due to convergent plate boundaries where oceanic plates are subducting beneath continental plates, leading to volcanic activity.

Chapter Concept:

Distribution of Earthquakes and Volcanoes

A.

Tidal forces from the moon

B.

Convection currents in the mantle

C.

Gravitational pull from the sun

D.

Polar-fleeing force due to Earth's rotation
Correct Answer: B

Solution:

Convection currents in the mantle, caused by the heat from radioactive decay and residual heat, drive the movement of tectonic plates.

Chapter Concept:

Plate Tectonics

A.

By creating a magnetic field

B.

By causing thermal expansion and contraction

C.

By generating heat that causes mantle material to rise and sink

D.

By altering the Earth's gravitational field
Correct Answer: C

Solution:

Convection currents in the mantle are generated by heat from radioactive decay, causing mantle material to rise and sink, which in turn moves the tectonic plates.

Chapter Concept:

Convectional Current Theory

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Distribution of Oceans and Continents

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True or False

Correct Answer: True

Solution:

Alfred Wegener, a German meteorologist, proposed the Continental Drift Theory in 1912, which included the concept of a supercontinent named Pangaea.

Chapter Concept :

Continental Drift Theory

Correct Answer: True

Solution:

Arthur Holmes' theory suggests that convection currents in the mantle are driven by heat from radioactive decay, which is responsible for the movement of tectonic plates.

Chapter Concept :

Convectional Current Theory

Correct Answer: True

Solution:

Harry Hess proposed the concept of sea floor spreading, where new oceanic crust forms at mid-ocean ridges and spreads outward, contributing to the movement of continents.

Chapter Concept :

Sea Floor Spreading

Correct Answer: True

Solution:

Sea floor spreading is a process where new oceanic crust is formed at mid-ocean ridges and spreads outward, as proposed by Harry Hess.

Chapter Concept :

Sea Floor Spreading

Correct Answer: True

Solution:

The distribution of identical fossils on continents now separated by oceans suggests that these landmasses were once joined, supporting the Continental Drift Theory.

Chapter Concept :

Continental Drift Theory

Correct Answer: False

Solution:

The Indian Plate continues to move, and the process of the Himalayas' uplift is ongoing, indicating that the plate has not remained static.

Chapter Concept :

Movement of the Indian Plate

Correct Answer: False

Solution:

Rocks on the ocean floor are much younger than those on continents, with oceanic crust rocks being less than 200 million years old.

Chapter Concept :

Sea Floor Spreading

Correct Answer: True

Solution:

The theory of plate tectonics indeed proposes that the Earth's lithosphere is divided into seven major and several minor plates, which move over the asthenosphere.

Chapter Concept :

Plate Tectonics

Correct Answer: True

Solution:

The mid-ocean ridges form an interconnected chain of mountain systems within the ocean and are characterized by a central rift system at the crest, which is a zone of intense volcanic activity.

Chapter Concept :

Ocean Floor Configuration

Correct Answer: False

Solution:

Harry Hess proposed that the spreading of one ocean does not cause the shrinking of another; instead, the oceanic crust is consumed at oceanic trenches.

Chapter Concept :

Sea Floor Spreading

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