You are presented with the question "What can cause landslides?" and the following answer choices: 
- The flow of water
 - loose soil
 - Drought
 - deforestation
 - Adequate subsurface drainage
 - mouth of rivers
 - Physical weathering
 - Lack of rain

Now knowing that erosion can cause a landslide and and the erosion caused by the unimpeded flow of water is an example of unintentional change, choose the best answer.


 

 The flow of water        