What is a common consequence of soil erosion?

• A. Increased water retention
• B. Improvement of soil fertility
• C. Loss of topsoil and nutrients
• D. Enhanced soil structure

Answer: (C)

Soil erosion is a process that results in the removal of the top layer of soil, which is often the most nutrient-rich layer crucial for plant growth. When soil erosion occurs, the topsoil, along with essential nutrients such as nitrogen, phosphorus, and potassium, is washed or blown away. This loss of topsoil leads to a decrease in soil fertility, making it harder for crops and plants to thrive. Furthermore, the removal of this nutrient-rich layer can lead to reduced agricultural productivity and increased susceptibility to further erosion, creating a cycle of degradation.

The other options imply outcomes that do not align with the effects of soil erosion. For instance, increased water retention suggests that soil retains moisture better after erosion, which is generally not the case as eroded soil often becomes compacted and less able to hold water. Improvement of soil fertility would indicate a beneficial effect, contrary to the negative consequences of erosion. Lastly, enhanced soil structure suggests that the soil has become more conducive to supporting life and growth, which is also not true in the context of significant erosion, as the structure and composition of the soil degrade.