Erosion can be caused by 
coastlines mouth of rivers vehicles heavy rains Pesticides deforestation detritus ice wedging
A B C D E F G H
Flooding is problematic because it causes erosion problems.
heavy rains cause erosion
Erosion can be caused by  (A) coastlines (B) mouth of rivers (C) vehicles (D) heavy rains (E) Pesticides (F) deforestation (G) detritus (H) ice wedging