Which of these is an environmental effect on deforestation?

a. temperature decrease

b. poisoning wildlife

c. soil erosion

d. water temperature increase

That would be C. Soil erosion. Deforestation means the destruction of trees, and trees have roots, roots which hold the ground in place, so when the wind blows, or water rushes thru it, it doesn't wash away. When trees get cut down, the roots die, and nothing is there to hold the soil down, so It washes away. Hope this helps!

i am positive it is c. condensing but i may be wrong

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.