That the cyclicalchange of the shape of the mantle produces potential energy force in earth's crust results in crustal movement.
地幔圈形状周期性变化使地壳产生势能（位能）力导致地壳运动。
2
Palin also restated her view that climate change is largely due to cyclical changes in the earth's atmosphere and not primarily caused by human behavior.
According to this article, the cyclicalchange of the natural factors is the main factor to the Sand-Dust weather, while artificial factors make strengthen action.