Which condition makes a landslide least likely according to the material?

Which condition makes a landslide least likely according to the material?

• A. High angle slope, fractured rock, and wet conditions
• B. Low angle slope, fractured rock, and dry conditions
• C. High angle slope, rock, and wet conditions
• D. Low angle slope, rock, and dry conditions

Answer: (D)

Landslides happen when the downslope gravitational force overcomes the material’s resistance. This resistance drops with larger slope angles, presence of weak or fractured rock, and moisture which reduces shear strength and increases pore pressure. So the condition that makes a landslide least likely combines a gentle slope, solid rock (not fractured), and dry conditions. A low-angle slope means less driving force, dry conditions keep strength high, and solid rock lacks planes of weakness, all reducing the chance of movement.

Landslides happen when the downslope gravitational force overcomes the material’s resistance. This resistance drops with larger slope angles, presence of weak or fractured rock, and moisture which reduces shear strength and increases pore pressure. So the condition that makes a landslide least likely combines a gentle slope, solid rock (not fractured), and dry conditions. A low-angle slope means less driving force, dry conditions keep strength high, and solid rock lacks planes of weakness, all reducing the chance of movement.