Question

What is the primary natural force driving the movement of soil or rock in a landslide?

• A. Wind pressure
• B. Water buoyancy
• C. Gravity
• D. Magnetic forces

Answer 1

Answer:

C. Gravity

The primary natural force driving the movement of soil or rock in a landslide is gravity.

• Gravity's Role: Gravity constantly pulls all material, including soil and rock, downwards.

• Slope Instability: A landslide occurs when this gravitational force, acting on a slope, overcomes the resisting forces (like friction and the internal strength of the material) that hold the slope together.