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。

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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.

印度洋脊是中大洋脊的一部分，中大洋脊是地壳分离的地球板块形成的。这一形成过程被称为海底扩张。

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As the rocks cool from lava, for instance at the deep mid-ocean ridges where the earth's surface plates are formed, crystals line up with the direction of the magnetic field.

举例来说由熔岩冷却的而来的岩石，位于深深的海中央山脊的地方就形成了地球表面的板块，水晶晶体排列方向与磁场方向一致。

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Both hotspots and mid-ocean ridges are volcanic, so Iceland is doubly so.

ECONOMIST: Volcanoes and air travel: Small eruption in Iceland | The

Given all the discoveries that we have made from an up-close investigation of these ocean ridges, we can't help but wonder what we might find at the far end of the same plate tectonic cycle where seafloor is drawn back into the Earth's interior at deep-ocean trenches.

CNN: Probing the ocean's undiscovered depths

At around 6:30, the rising sun slowly reveals the rolling ridges all around us that seem to move like ocean waves toward the flat Utah deserts to the west.

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