Erosion can cause a landslide.
And the erosion caused by the unimpeded flow of water is an example of unintentional change.
The flow of water can cause a landslide.
What can cause landslides?

1: The flow of water
2: loose soil
3: Drought
4: deforestation
5: Adequate subsurface drainage
6: mouth of rivers
7: Physical weathering
8: Lack of rain