The result: underwater mountains and hills all along the axis of the mid-ocean ridge.
其结果便是：沿着大洋中脊形成了海底山脉和山丘。
2
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。
3
This is part of the system of mid-ocean ridges that form as the tectonic plates of the Earth's crust move apart-a process known as sea floor spreading.