geological condition type of coal mine

例句：

1. 1. The geological survey is crucial forunderstanding the region's history.
   地质调查对于理解该地区的历史至关重要。
2. 2. Thegeological formations arefascinating and offer insights into theearth's past.
   地质构造令人着迷，为我们提供了对地球过去的见解。
3. 3. The geological evidence suggests that thearea was once covered by a thick layerof ice.
   地质证据表明，该地区曾经被厚厚的冰层覆盖。