Question

what effect did mechanized farming have on the environment? it led to an increase of pollution in the cities. it eliminated the erosion of topsoil. it led to a decrease of pollution in rural areas. it contributed to a depletion of water sources.

Explanation:

Mechanized farming uses machinery which often requires large - scale irrigation, leading to water source depletion. It doesn't directly increase city pollution. It can cause top - soil erosion instead of eliminating it, and usually increases rural pollution due to fuel use and chemical runoff.

Answer:

It contributed to a depletion of water sources.