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

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AWind pressure

BWater buoyancy

CGravity

DMagnetic forces

Answer:

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.

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