Solution Cave entrance Present water table Underground water channel FIGURE 43-5 Surface and underground features of temperate lower and solution proceeds.A new cave network will form karst.When the groundwater table was higher,the solution when the next drop in the water table occurs. features at levels A and B formed.Now the water table is 溶洞：是地下水沿着可溶性岩石的层面、节 理或断层进行溶蚀和侵蚀而成的地下孔道。 溶洞:是地下水沿着可溶性岩石的层面、节 理或断层进行溶蚀和侵蚀而成的地下孔道