The explanation may be in Earth's mantle, the layer of rock underlying the tectonic plates and extending down over 1,800 miles to the outer edge of Earth's iron core.
解释可能是在地球的地幔中，这是在构造板块下面的岩石层，向下延伸超过1800英里到地球铁芯的外边缘。
There one plate dives under the edge of another and is reincorporated into the mantle.
在这里，一块板块潜没到另一板块的边缘之下并结合入地幔之中。
There one plate dives under the edge of another and is reincorporated into the mantle.
在这里，一块板块潜没到另一板块的边缘之下并结合入地幔之中。
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