If an ocean floor tectonic plate meets the edge of a continent and they push against each other, the heavier one sinks down and goes under the other one.

如果一个海底构造板块与大陆边缘接触并相互挤压，较重的板块下沉到另一个的下面。

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It all began in 1977 with the exploration of hydrothermal vents on the ocean floor.

一切始于1977年的一次海底上深海热泉的探索。

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More and more of this plate, the ocean floor, would go down under the continent into the mantle.

越来越多的这种板块，即海床，将在大陆下方进入地幔。

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In time,they said, the moving ocean floor is blocked when it comes up against the edge of a continent.

VOA: special.2010.01.12

Mister Wegener said the lighter continental rock floated up through the heavier basalt rock of the ocean floor.

VOA: special.2010.01.12

They are now discovering strange, new species of plants, animals and organisms surviving near hot currents that come out of the ocean floor.

VOA: special.2009.01.13

When the drill unit sank on Thursday, we immediately and intensely investigated by remotely operated vehicles the entire 5, 000 feet of pipe that's on the floor of the ocean.

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Locating a ship resting on the floor of the ocean for many decades is somewhat different than finding a submersible to get to that depth and plugging many leaks in a riser pipe and in a blowout preventer.

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They picked up critters from as deep as 6km, and they did so using both typical trawling nets and a special box that was designed to scoop up a slab of ocean floor along with a slice of undisturbed water from immediately above it.

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