The location and extent of aquifers is dependent upon the geological conditions of the underlyingrock.
含水层的位置和范围是根据下垫岩石的地质条件所决定的。
2
But the glacier is now receding, so a draft agreement has been proposed to create a new border that coincides with the ridge of the underlyingrock.
然而，如今的冰川正一点点退去，因此一份协议草案摆了上来，提出以地下岩石山脊为新界限。
3
The resulting composite is the most detailed and accurate portrait of the US land surface and the ages of its underlyingrock formations yet displayed in the same image.