Bad weather, such as the heavy summer rains, after drouth, which saturate ploughed soil, reduce soil shear strength, facilitate masse soil movement, and instigate gullying.
Back in the 1950s and 60s, mineral exploration work and clearance of trees for wood, firewood, exposed the surface to erosion, and the gully, with water flowing down, it cut down into very ice-rich permafrost.
久旱之后的夏季强降
，使
耕地饱和，降低
变力，容易使
轴
火，使地表暴露于侵蚀之中，水流沿着
久冻土层。
