Real-world examples of landslides caused by gravity.

📚 Quick Study Guide

• ⛰️ Landslides are the movement of rock, soil, or debris down a slope.
• ⚖️ Gravity is the primary force driving landslides. It pulls everything downwards.
• 💧 Water can increase the weight of the soil and reduce friction, making landslides more likely.
• 🌳 Deforestation removes tree roots that hold soil together, increasing landslide risk.
• 🚧 Human activities like construction and mining can destabilize slopes.
• 🌋 Earthquakes and volcanic eruptions can trigger landslides.
• 📏 The angle of repose is the steepest angle at which a slope is stable. Exceeding this angle increases landslide risk.

🧪 Practice Quiz

1. Which force is the primary driver of landslides?
   1. A) Friction
   2. B) Gravity
   3. C) Cohesion
   4. D) Buoyancy
2. How does water typically affect the stability of a slope?
   1. A) Increases friction
   2. B) Decreases weight
   3. C) Increases stability
   4. D) Reduces friction
3. What is the impact of deforestation on landslide occurrence?
   1. A) Decreases landslide risk
   2. B) No impact on landslide risk
   3. C) Increases landslide risk
   4. D) Stabilizes the soil
4. Which human activity can increase the risk of landslides?
   1. A) Reforestation
   2. B) Sustainable agriculture
   3. C) Construction on steep slopes
   4. D) Planting cover crops
5. Earthquakes can trigger landslides because they:
   1. A) Increase soil cohesion
   2. B) Decrease the angle of repose
   3. C) Cause ground shaking and instability
   4. D) Reduce gravitational forces
6. What does 'angle of repose' refer to?
   1. A) The angle at which water flows on a slope
   2. B) The steepest angle a slope can maintain without collapsing
   3. C) The angle of sunlight on a slope
   4. D) The angle of tree roots in the soil
7. How do volcanic eruptions contribute to landslides?
   1. A) By cooling the soil
   2. B) By stabilizing mountain slopes
   3. C) By depositing heavy ash and destabilizing slopes
   4. D) By reducing rainfall