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Geography – Fundamentals of Physical Geography

Geomorphic Processes

Geomorphic Processes

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Study Action Plan (Sorted by Difficulty)
Endogenic Processes
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Erosion and Deposition
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Exogenic Processes
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Geomorphic Processes
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Mass Movements
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Soil Formation
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Weathering
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Learning Objectives

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Learning Objectives

  • Understand the dynamics of geomorphic processes, including both endogenic and exogenic forces, and their role in shaping the Earth's surface.
  • Analyze the mechanisms of endogenic processes such as diastrophism and volcanism, and their impact on crustal movements and landform creation.
  • Examine the influence of exogenic processes driven by solar energy and gravity, including weathering, erosion, and deposition, on landscape modification.
  • Explore the various types of weathering processes, including mechanical, chemical, and biological, and their dependence on climatic and geological factors.
  • Investigate the role of mass movements, such as landslides and debris flows, in altering landscape stability and contributing to geomorphic changes.
  • Evaluate the processes of erosion and deposition by agents like water, wind, and ice, and their contribution to landscape evolution.
  • Understand the process of soil formation through weathering and biological activity, and the influence of factors such as parent material, topography, climate, and time on soil development.

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Revision Notes & Summary

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Chapter Notes

Geomorphic Processes

  • Definition: Geomorphic processes refer to the endogenic and exogenic forces causing physical stresses and chemical actions on earth materials, leading to changes in the earth's surface configuration.
  • Endogenic Processes: Driven by internal earth energy, including diastrophism and volcanism, affecting crustal movements and landform creation.
  • Exogenic Processes: Powered by solar energy and gravity, including weathering, erosion, and deposition, modifying the earth's surface.

Endogenic Processes

  • Diastrophism: Involves processes that move, elevate, or build up portions of the earth's crust, including orogenic (mountain building), epeirogenic (continental building), earthquakes, and plate tectonics.
  • Volcanism: Movement of molten rock (magma) onto or toward the earth's surface, forming intrusive and extrusive volcanic structures.

Exogenic Processes

  • Weathering: Breakdown of rocks through mechanical, chemical, and biological processes.
    • Chemical Weathering: Involves solution, carbonation, hydration, oxidation, and reduction.
    • Physical Weathering: Depends on forces like gravitational, expansion due to temperature changes, and water pressures.
    • Biological Weathering: Involves organisms contributing to mineral removal and physical changes.
  • Mass Movements: Gravity-driven movements of rock debris, including landslides, slumps, and debris flows.
  • Erosion and Deposition: Involves the removal and transportation of materials by agents like water, wind, and ice, leading to landscape changes.

Soil Formation

  • Process: Development of soil through weathering and biological activity.
  • Soil-forming Factors:
    • Parent Material: In-situ or transported deposits influencing soil texture and composition.
    • Topography: Affects exposure to sunlight and drainage.
    • Climate: Involves moisture and temperature influencing chemical and biological activities.
    • Biological Activity: Vegetative cover and organisms contribute to organic matter and nitrogen fixation.
    • Time: Duration of soil-forming processes determining soil maturity and profile development.

Key Concepts

  • Gradation: Wearing down of relief variations through erosion.
  • Denudation: General term covering weathering, mass wasting, erosion, and transportation.
  • Enrichment: Concentration of valuable ores through weathering processes.
  • Pedogenesis: Soil formation process, reliant on weathering mantle as the basic input.
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Practice Test – MCQs, True/False

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Multiple Choice Questions

A.

It directly affects the mineral composition of the soil

B.

It determines the maturity and profile development of soils

C.

It influences the biological activity in the soil

D.

It changes the texture of the parent material
Correct Answer: B

Solution:

Time is crucial in soil formation as it allows for the development of soil profiles and the maturation of soils through prolonged weathering and biological processes.

Chapter Concept:

Soil Formation

A.

The elevation of landforms by endogenic forces.

B.

The wearing down of relief variations through erosion.

C.

The creation of new landforms through volcanic activity.

D.

The deposition of sediments in new locations.
Correct Answer: B

Solution:

Gradation refers to the process of wearing down relief variations on the Earth's surface through erosion, which is an exogenic process.

Chapter Concept:

Endogenic Processes

A.

Formation of soil

B.

Erosion of rocks

C.

Creation of regolith

D.

Formation of landforms
Correct Answer: D

Solution:

While weathering contributes to the formation of soil and regolith, and aids in erosion, the direct formation of landforms is more associated with processes like erosion and deposition.

Chapter Concept:

Weathering

A.

Epeirogeny

B.

Orogeny

C.

Volcanism

D.

Mass wasting
Correct Answer: B

Solution:

Orogeny is the process involving severe folding and deformation of the Earth's crust, leading to mountain building.

Chapter Concept:

Endogenic Processes

A.

Chemical weathering

B.

Physical weathering

C.

Biological weathering

D.

Hydration
Correct Answer: B

Solution:

Physical weathering, particularly thermal expansion and contraction, would dominate in regions with significant temperature fluctuations and minimal precipitation, as chemical reactions require moisture.

Chapter Concept:

Weathering

A.

Epeirogeny

B.

Orogeny

C.

Volcanism

D.

Deposition
Correct Answer: B

Solution:

Orogeny involves mountain building through severe folding, affecting long and narrow belts of the earth's crust.

Chapter Concept:

Geomorphic Processes

A.

It is a force that causes the uplift of mountain ranges.

B.

It acts as a directional force activating downslope movements of matter.

C.

It is responsible for the horizontal movement of tectonic plates.

D.

It primarily contributes to the chemical weathering of rocks.
Correct Answer: B

Solution:

Gravity acts as a directional force that activates all downslope movements of matter, which is crucial for processes such as mass wasting and erosion.

Chapter Concept:

Geomorphic Processes

A.

Exogenic forces build up landforms, while endogenic forces wear them down.

B.

Endogenic forces continuously elevate the Earth's surface, while exogenic forces work to degrade it.

C.

Both exogenic and endogenic forces work to flatten the Earth's surface.

D.

Exogenic forces have no impact on the Earth's surface compared to endogenic forces.
Correct Answer: B

Solution:

Endogenic forces are responsible for building up the Earth's surface through processes like volcanism and diastrophism, whereas exogenic forces degrade the surface through erosion and weathering.

Chapter Concept:

Endogenic Processes

A.

They determine the type of volcanic activity.

B.

They control the intensity and type of weathering.

C.

They affect the rate of plate tectonics.

D.

They influence the formation of new minerals.
Correct Answer: B

Solution:

Climatic factors such as temperature and precipitation control the intensity and type of weathering processes, which are a part of exogenic geomorphic processes.

Chapter Concept:

Exogenic Processes

A.

Increases chemical activity in colder temperatures

B.

Decreases chemical activity in warmer temperatures

C.

Increases chemical activity in warmer temperatures

D.

Has no effect on chemical activity
Correct Answer: C

Solution:

Higher temperatures increase chemical weathering by accelerating chemical reactions.

Chapter Concept:

Geomorphic Processes

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Geomorphic Processes

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True or False

Correct Answer: False

Solution:

Soil formation depends on multiple factors including parent material, topography, climate, biological activity, and time, not just weathering.

Chapter Concept :

Soil Formation

Correct Answer: False

Solution:

Soil formation, or pedogenesis, depends first on weathering, which is the basic input for soil to form. Erosion is a degradational process that contributes to landscape changes but is not solely responsible for soil formation.

Chapter Concept :

Erosion and Deposition

Correct Answer: False

Solution:

Biological activity is an active factor in soil formation, contributing organic matter and aiding in processes like nitrogen fixation.

Chapter Concept :

Soil Formation

Correct Answer: False

Solution:

While weathering aids erosion by breaking down rocks, it is not a prerequisite for erosion, which can occur independently through geomorphic agents.

Chapter Concept :

Exogenic Processes

Correct Answer: False

Solution:

While weathering aids mass movements, it is not a pre-requisite for them. Mass movements can occur on both weathered and unweathered slopes.

Chapter Concept :

Mass Movements

Correct Answer: True

Solution:

Erosion involves the acquisition and transportation of rock debris by agents such as running water, wind, and glaciers.

Chapter Concept :

Erosion and Deposition

Correct Answer: True

Solution:

Endogenic processes are responsible for elevating or building up parts of the Earth's surface, contributing to landform creation.

Chapter Concept :

Endogenic Processes

Correct Answer: False

Solution:

Exogenic geomorphic processes rely on geomorphic agents such as water, ice, and wind to transport and deposit earth materials.

Chapter Concept :

Exogenic Processes

Correct Answer: True

Solution:

Chemical weathering processes such as solution, carbonation, hydration, oxidation, and reduction rely on water and air (oxygen and carbon dioxide) along with heat to speed up chemical reactions that decompose or alter rocks.

Chapter Concept :

Weathering

Correct Answer: False

Solution:

Weathering is a critical process in soil formation, but it is not solely responsible. Soil formation also depends on factors such as parent material, topography, climate, biological activity, and time.

Chapter Concept :

Weathering

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