Question

which event is least likely to trigger a mass movement on a slope? a. several days of heavy rainfall b. waves pounding repeatedly against a cliff c. an earthquake or its aftershocks d. the growth of deep - rooted trees

Explanation:

To determine which event is least likely to trigger a mass movement on a slope, we analyze each option:

• Option A: Heavy rainfall adds weight and reduces soil friction, triggering mass movement.
• Option B: Repeated wave pounding erodes cliffs, causing mass movement.
• Option C: Earthquakes/aftershocks destabilize slopes, triggering mass movement.
• Option D: Deep - rooted trees stabilize slopes by holding soil with their roots, so their growth is least likely to trigger mass movement.

Answer:

D. the growth of deep - rooted trees