Divergent Boundaries
分离边界
At divergent boundaries where tectonic plates move apart, there will be upwelling material from the mantle to create new seafloor.
在板块分离边界，当构造板块相互远离时，地幔中的物质会上涌，形成新的海底。
 | A major example of a divergent boundary is the Mid-Atlantic Ridge. 一个典型的分离边界例子是中大西洋海岭。 |
| This is another depiction of the Mid-Atlantic-Ridge. It is a portion of an image from the USGS site and a part of their discussion of plate motions.
The extent of separation associated with the Mid-Atlantic Ridge is about 5600 km and the extreme separation exhibits an age of about 180 million years. This gives an average velocity of separation of about 3.1 cm/yr with relative rates scaled from 2.8 to 4.4 cm/yr. The current rate of spreading is about 2.5 cm/year, showing general consistency with the overall distance and measured time. 与中大西洋海岭相关的分离程度约为5600公里，极端分离显示出约180百万年的年龄。这给出了分离的平均速度约为3.1厘米/年，相对速率从2.8到4.4厘米/年。当前的扩张速率约为2.5厘米/年，总体上与整体距离和测量时间保持一致。
这是对中大西洋海岭的另一种描绘。它是一张来自USGS网站的图片的一部分，也是他们讨论板块运动的一部分。 |
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| Plate Tectonics
板块构造 |
这张图来自维基百科，可以自由使用。更高分辨率的版本可从 http://commons.wikimedia.org/wiki/Image:Mid-atlantic_ridge.jpg 获取。
Geophysics concepts
索引 地球物理学概念
| HyperPhysics | R Nave |
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