From one side this reflects a difference between the properties of the marginal sea crust and ocean crust.

这从一个侧面反映出边缘海洋壳与大洋壳本质上的差异。

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And the ocean crust off the northeast part of Japan, having formed about 140 million years ago, is about as old as it can get.

日本东北部的海洋地壳形成于1亿4千万年前，这已经很久很久了。

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Sea salt not only dissolves from rocks, it also reacts with the rocks of the ocean crust and volcanic lava. The reactions take some of the salts in seawater away from the sea.

岩石溶解产生海盐，而同时，海盐又与大洋地壳中的岩石和火山熔岩进行化学反应，从而把一部分盐分从海水中带走。

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To make room for the continual addition of new ocean crust, all the Earth's plates move.

BBC: The Pacific 'Ring of Fire'

In December 1995 the space probe Galileo showed that Europa probably has an ocean beneath its icy crust, with tidal heating providing a likely energy source.

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Pictures of the icy satellite Enceladus suggest its surface splits and spreads apart - just like the ocean floor on our planet splits to create new crust.

BBC: Enceladus has 'spreading surface'