Fact 1: Erosion can cause a landslide.

Fact 2: Landslides Seismic vibration is a common triggering mechanism for landslides.

Given the two facts above, answer the question "What can cause seismic vibrations, which are triggering mechanisms?" with the following options: 
- wind
 - erosion
 - vehicles
 - flooding
 - waves
 - rivers
 - energy
 - mines


 

  erosion       