Which of the following poses a threat to healthy topsoil?

Question

Quizplus · Accepted Answer

Monocultural plantings can quickly deplete the nutrients and organic matter in topsoil, making it less productive and more susceptible to erosion. Letting crop remnants and weeds decay into the topsoil and mixing compost into the topsoil can actually help replenish nutrients and organic matter, while farmers putting manure on the topsoil can contribute to the soil's fertility as long as it is managed properly.

Which of the Following Poses a Threat to Healthy Topsoil