Erosion is mainly caused by water, but deforestation, over-grazing, wind, and tectonic movement can also play a role. As for mountainsides specifically, i would have to say deforestation.
land degradation causes soil errosion which further lead to drought and desertification.
No rain means dry periods which could lead to a longer-term severe dryness called a drought.
drought drought
a drought
deforstation increase the likehood of mudflow because deforstation often result in a devastating mudflow
Deforestation, climate change, insects, drought.
Deforestation of rainforests will likely lead to extensive extinction of species.
Examples: pollution, floods, landslides, drought, earthquakes, deforestation etc.
Irrigation can lead to deforestation because the need for clear paths will lead to the removal of trees and plants. After much removal forests will shrink dramatically in size.
Flooding and erosion.
It is when fertile land becomes a desert. This usually happens due to drought, deforestation, of inappropriate agriculture.
The process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture.
The clearing of Forrest and expiation of roads can lead to deforestation.
Lack of rainfall
According to historians, the Mayas contributed to their own empirical demise by cutting down more trees during periods of drought in order to expand their impact. Experts suggest this contributed to deforestation because the trees could not replenish themselves during the drought season and the Mayan demands.
Deforestation has created problems with soil runoff, drought, and pollution. It also has contributed to a desertification of the region which makes it harder for communities to base their economy and food systems around livestock.