Mechanical weathering can be caused by select all that apply. a. gravity b. acid rain c. freezing and thawing in the absence of water d. freezing and thawing in the presence of water

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.