How do erosion, desertification, deforestation, and damming impact the environment?

Hello! Erosion causes changes in land appearance and/or land functions.
Desertification makes the land almost unusable and in a desert-like state. It is hard to reap crops from a desert-like land and it also impacts the wildlife.
Deforestation devastates the environment but also allows room for houses and infrastructure in a settlement.
Damming disrupts the aquatic environment and the fish are somewhat trapped unless there is a fish ladder,

I hope this helps!