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Exploring rainfall-induced landslides and sinkholes and their impact on communitiesΒ
π― Learning Targets
π― Learning Targets
At the end of this lesson, you are expected to:
Explain the nature, characteristics, and effects of landslides and sinkholes
Show awareness of the dangers and impacts of these hazards in your community
Identify and classify areas prone to landslides and sinkholes using visual aids or maps
π Lesson Overview
π Lesson Overview
Geological hazards are natural processes that can cause damage to property, the environment, and human life. In this lesson, you will learn about rainfall-induced landslides and sinkholes, how they form, why they occur, and how understanding them helps reduce disaster risk.
π What Are Geological Hazards?
π What Are Geological Hazards?
Geological hazards are natural events caused by geological processes that can threaten lives, property, and the environment.
Examples include:
π§οΈ Landslides
π³οΈ Sinkholes
π Volcanic eruptions
π Earthquakes
This lesson focuses on landslides and sinkholes, which are common in areas with heavy rainfall, weak soil, or underground erosion.
β°οΈ Landslides
β°οΈ Landslides
Definition: Movement of rock, soil, or debris down a slope due to gravity.
Characteristics: Steep slopes, loose soil, can occur fast or slow, often triggered by rainfall or earthquakes.
Types of Landslides
Types of Landslides
πͺ¨ Rockfall: Rocks breaking loose and falling from cliffs
π Debris Flow: Mixture of soil, rocks, and water moving rapidly
π§οΈ Mudslide: Water-saturated soil flowing downhill
π Creep: Very slow, gradual movement of soil or rock down a slope, often damaging fences or roads
π Slump: Rotational movement along a curved surface, creating step-like terraces on slopes
π³οΈSinkholes
π³οΈSinkholes
Definition: Depressions or holes in the ground caused by surface collapse.
Causes: Erosion, groundwater movement, mining, or construction.
Characteristics: Sudden or gradual appearance, often in limestone areas, can damage roads and buildings.
Types of Sinkholes
β¬οΈ Solution/Dissolution Sinkhole: Gradual dissolution of limestone over time creates a depression
π₯ Cover - Collapse Sinkhole: Sudden collapse of the surface layer, often very dangerous
π Cover - Subsidence Sinkhole: Slow sinking of the ground, sometimes unnoticed at first
Areas Prone to Hazards
Areas Prone to Hazards
Landslide-Prone: Steep slopes, loose soil, regions with heavy rainfall π§οΈ
Sinkhole-Prone: Limestone-rich areas, places with groundwater extraction, areas near mining π³οΈ
Why Understanding Hazards Matters
Why Understanding Hazards Matters
Reduces loss of life and property π
Informs safer settlement and land use πΊοΈ
Guides community preparedness and response π¨
- Family Emergency Preparedness
Before: Identify hazard-prone areas, prepare emergency kit, plan evacuation routes π
During: Follow evacuation orders, stay away from slopes and cracks β οΈ
After: Avoid damaged areas, report hazards, stay alert for secondary events ποΈ
Extra Resources:
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