海底钻井平台将寻找石油的区域延伸到了海洋大陆架——大陆边缘那些平缓倾斜的海底区域。
This ice is often held in place by shallow ocean bottoms or continental shelves.这些冰层常常固定在浅海的海底或者大陆架上。
Much of the activity between the continental shelves takes place deep underwater at the mid-ocean ridges.大部分的大陆架的活动发生在深水下的大洋洋底的海脊。