洞穴
2014-03-06 00:00:00
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<span style="line-height:2;font-family:SimSun;font-size:14px;"> 花岗岩是不易溶解的岩石,因此不能形成在石灰岩地区常见的</span><span style="line-height:2;font-family:SimSun;font-size:14px;">溶洞。但雨水沿花岗岩体内断裂冲刷,断裂上盘岩块的崩塌,能形</span><span style="line-height:2;font-family:SimSun;font-size:14px;">成不规则的堆石洞。</span>