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Mass wasting — KCSE Geography

KCSE Geography · 113 practice questions · 12 syllabus objectives · 12 revision lessons

37 easy38 medium38 hard

Last updated · Aligned to the KNEC KCSE syllabus

What You'll Learn

Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.

Describe control measures for mass wasting and plan a field study (objectives, methods, problems, follow-up)

Define mass wasting (mass movement) and classify the types: soil creep, landslides, mudflows, rock falls, slumping

Explain the factors that trigger mass wasting and describe the consequences for settlements, infrastructure and agriculture

Describe measures that can be taken to prevent and manage the effects of mass wasting

Define mass wasting and mass movement; differentiate them from weathering and denudation; identify the two broad categories (slow and rapid)

Explain factors that influence mass wasting (slope angle, water content, vegetation, gravity, earthquakes, type of material, human activities including mining)

Identify slow mass-wasting processes (soil creep, talus creep, solifluction); describe their occurrence and effects

Identify rapid mass-wasting processes (landslides, rockfalls, rockslides, mudflows, earthflows, slumping, avalanches); describe how each occurs and conditions that favour them

Identify the type of mass movement from a description of slope conditions, materials and visible features (scenario-based identification)

Explain the negative effects of mass wasting on the physical environment and on human activities, including settlements, transport and agriculture

Describe resultant landforms of mass wasting (creation of lakes by river damming, new landforms such as scars, debris fans, hummocky topography)

Mass wasting

Revision Notes

Concise lesson notes for Mass wasting, written to the KCSE Geography marking standard. Read the first lesson free below.

Control Measures for Mass Wasting

Mass wasting refers to the movement of soil and rock down slopes due to gravity. To mitigate its effects, various control measures can be employed:

  • Revegetation: Planting trees and vegetation helps stabilize the soil with roots, reducing erosion.
  • Terracing: Creating terraces on steep slopes decreases water runoff and soil erosion, allowing for better water absorption.
  • Drainage control: Installing drainage systems prevents water accumulation, which can lead to landslides.
  • Retaining walls: Building walls can support slopes and prevent soil movement.

When planning a field study on mass wasting, consider the following:

  1. Objectives: Identify areas prone to mass wasting and assess the effectiveness of control measures.
  2. Methods: Use surveys, soil sampling, and observation to collect data on slope stability and vegetation cover.
  3. Problems: Anticipate challenges such as accessibility to sites, weather conditions, and potential safety hazards.
  4. Follow-up: Analyze data collected, evaluate the success of control measures, and suggest improvements based on findings.

Key points to remember

  • Revegetation stabilizes soil through plant roots.
  • Terracing reduces runoff and erosion on slopes.
  • Drainage systems prevent water accumulation.
  • Retaining walls provide slope support.
  • Field study should assess effectiveness of measures.

Worked example

Question: Describe two control measures for mass wasting and their benefits. Answer: - Revegetation: Stabilizes soil and reduces erosion through plant roots.

  • Terracing: Minimizes water runoff, allowing better soil absorption and reducing landslide risk.

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More lessons in this topic

Lesson 2: Understanding Mass Wasting and Its Types

Objective: Define mass wasting (mass movement) and classify the types: soil creep, landslides, mudflows, rock falls, slumping

Mass wasting, also known as mass movement, refers to the downward movement of soil and rock under the influence of gravity. This process can occur slowly or rapidly and is influenced by factors such as water content, slope angle, and vegetation cover.

Types of Mass Wasting:

  1. Soil Creep: A slow, gradual movement of soil down a slope, often noticeable by the bending of trees and fences.
  2. Landslides: A rapid movement of a large amount of earth material down a slope, often triggered by heavy rainfall or earthquakes.
  3. Mudflows: A fast-moving mixture of water and soil that flows down slopes, typically occurring in areas with heavy rainfall.
  4. Rock Falls: The sudden and rapid falling of rock from a steep slope or cliff, often due to weathering processes.
  5. Slumping: A type of mass wasting where a section of the slope moves downwards as a single unit, often creating a crescent-shaped scar.

Understanding these types of mass wasting is crucial for predicting and managing land use and safety in hilly and mountainous areas.

  • Mass wasting is the movement of soil and rock due to gravity.
  • Types include soil creep, landslides, mudflows, rock falls, and slumping.
  • Soil creep occurs slowly and bends structures.
  • Landslides and mudflows can be rapid and destructive.
  • Slumping involves movement as a single unit.

Define mass wasting and classify its types.
Mass wasting is the downward movement of soil and rock due to gravity. Types include: 1. Soil creep (slow movement), 2. Landslides (rapid movement), 3. Mudflows (water-saturated soil), 4. Rock falls (sudden rock drop), 5. Slumping (unit movement).

Lesson 3: Factors Triggering Mass Wasting

Objective: Explain the factors that trigger mass wasting and describe the consequences for settlements, infrastructure and agriculture

Mass wasting refers to the downward movement of soil and rock due to gravity. Key factors that trigger mass wasting include:

  • Water saturation: Heavy rainfall or rapid snowmelt can saturate soil, reducing its stability.
  • Slope angle: Steeper slopes are more prone to mass wasting events.
  • Vegetation removal: Deforestation or wildfires decrease root strength, leading to soil erosion.
  • Earthquakes: Seismic activity can destabilize slopes, triggering landslides.
  • Human activities: Construction, mining, and road building can disturb soil and increase mass wasting risks.

Consequences of mass wasting include:

  • Settlements: Landslides can destroy homes and displace communities.
  • Infrastructure: Roads, bridges, and railways may be damaged, disrupting transport and communication.
  • Agriculture: Soil erosion can reduce arable land and crop yields, threatening food security.
  • Water saturation reduces soil stability, triggering mass wasting.
  • Steeper slopes are more susceptible to landslides.
  • Vegetation loss increases soil erosion risks.
  • Earthquakes can destabilize slopes, causing mass wasting.
  • Mass wasting impacts settlements, infrastructure, and agriculture.

Explain two factors that trigger mass wasting and their consequences.

  • Water saturation: Heavy rainfall can lead to landslides, damaging homes.
  • Vegetation removal: Deforestation reduces soil stability, leading to erosion and loss of farmland.
Lesson 4: Preventing and Managing Mass Wasting

Objective: Describe measures that can be taken to prevent and manage the effects of mass wasting

Mass wasting refers to the movement of soil and rock down a slope due to gravity. To prevent and manage its effects, several measures can be implemented:

  • Terracing: This involves creating stepped levels on slopes to reduce runoff and soil erosion.
  • Reforestation: Planting trees stabilizes the soil with roots, reducing the risk of landslides.
  • Drainage Control: Installing drainage systems helps divert water away from slopes, preventing saturation and subsequent mass wasting.
  • Retaining Walls: Constructing walls can provide structural support to prevent soil movement.
  • Regular Monitoring: Assessing slopes for signs of instability can help in early detection and intervention.

By integrating these measures, communities can significantly reduce the risks associated with mass wasting and protect their infrastructure and environment.

  • Terracing reduces soil erosion and controls runoff.
  • Reforestation stabilizes soil with tree roots.
  • Drainage systems prevent water saturation on slopes.
  • Retaining walls provide structural support against mass wasting.
  • Regular monitoring helps detect slope instability early.

Question: Describe two measures that can be taken to prevent mass wasting.

  • Terracing creates steps that slow down water flow and reduce erosion.
  • Reforestation involves planting trees, which help anchor the soil and prevent landslides.

Sample Questions

Read 3 questions and answers free. Sign up to access all 113 questions with full KNEC-style marking schemes and a personalised study plan.

1
easySHORT ANSWER3 marks

Define soil creep and explain its occurrence and effects on the landscape. (3 marks)

Answer & marking scheme

Part (a) — 1 mark
Soil creep is the slow, gradual movement of soil down a slope due to gravity (1 mk)
Part (b) — 2 marks
Occurs on slopes where soil is saturated with water or when freeze-thaw cycles occur (1 mk)
Effects include the tilting of trees, fences, and walls, and the formation of terracettes (1 mk)
2
easySHORT ANSWER3 marks

State three factors that contribute to the occurrence of mass wasting in hilly areas. (3 marks)

Answer & marking scheme

Part (a) — 3 marks
Steep slope angles increase gravitational pull on materials (1 mk)
Increased water content reduces soil cohesion (1 mk)
Loss of vegetation exposes soil to erosion and instability (1 mk)
3
easySHORT ANSWER3 marks

List three engineering measures that can be employed to prevent mass wasting on slopes. (3 marks)

Answer & marking scheme

Part (a) — 3 marks
Construction of retaining walls to support soil and prevent sliding (1 mk)
Installation of drainage systems to manage water flow and reduce saturation (1 mk)
Use of geotextiles to stabilise soil and prevent erosion (1 mk)
4

Define the term mass wasting and explain how human activities can exacerbate this phenomenon. (3 marks)

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Frequently asked questions

What does the KCSE Geography topic "Mass wasting" cover?

Mass wasting covers Describe control measures for mass wasting and plan a field study (objectives, methods, problems, follow-up); Define mass wasting (mass movement) and classify the types: soil creep, landslides, mudflows, rock falls, slumping; Explain the factors that trigger mass wasting and describe the consequences for settlements, infrastructure and agriculture, and more, all aligned to the official KNEC KCSE Geography syllabus.

How many practice questions are available for Mass wasting?

HighMarks has 113 Mass wasting practice questions for KCSE Geography, each with a full marking scheme. The first 3 are free; sign up to access the rest, plus all KCSE mock exams and past papers.

Are these aligned with the KNEC KCSE syllabus?

Yes. Every objective on this page is taken directly from the official KNEC KCSE Geography syllabus. Practice questions match the KCSE exam format and are graded against the standard KNEC marking scheme.

How should I revise Mass wasting for the KCSE exam?

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