Studies of thegravity field of the Earth indicate that its crust and mantle yieldwhen unusual weight is placed on them。

对地球引力的研究表明，在不寻常的负荷之下地壳和地幔会发生位移。

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The history of the Earth's magnetic field provides basic information on the dynamics of core mantle boundary and core convection.

地球磁场的演化历史对研究地核与地幔边界的动力学和地核内的磁流体力学过程提供了重要的信息。

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One important finding was that most of the geomagnetic field originates at only four broad regions on the core-mantle boundary.

重要的发现之一，是地球的大部份磁场仅来自地核–函交界面上的四个广大区域。

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The field of Mantle Walls, near Ancrum, has long been suspected to have been the site of a major medieval building.

BBC: Ancrum bishop's palace search begins

I've likened it to being the man the Yankees sent out in center field after Joe DiMaggio and Mickey Mantle.

NPR: Alan Greenspan and the Federal Reserve

Was its magnetic field disrupted as the magma in its mantle cooled, exposing it to solar winds?

NEWYORKER: The Martian Chroniclers