Soil erosion is a big problem in many areas. Scientists studied soil properties in granite and limestone regions in China to see how they affect soil erosion. They looked at things like soil texture, organic matter, and pH. In granite soil, the type of soil particles was most important for predicting erosion. In limestone soil, organic matter content was the key factor. The researchers found that limestone soil had lower erosion rates than expected because the soil was better at absorbing water.