Soil erosion is the process where the top layer of soil is worn away by natural forces such as water, wind, and ice. This can happen gradually over time or more rapidly during heavy rainfall or strong winds. When soil is eroded, it can lead to the loss of nutrients, making it harder for plants to grow. Human activities, like deforestation and agriculture, can also contribute to soil erosion. When trees are cut down or land is plowed, the protective cover that holds the soil in place is removed. This increases the risk of erosion, which can result in decreased soil fertility and increased sediment in rivers and streams.