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(man) I'm glad you brought up the question of our investigations into the makeup of the Earth's interior. In fact --- since this is the topic of your reading assignment for next time --- let me spend these last few minutes of class talking about it.

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And what causes these massive intraplate rupturings? 这种跨板块大地震是怎么发生的？ Something deep within the Earth. 原因在地球深处。 More than that we don't know. 更多的情况我们就不知道了。 By the 1960s scientists

万物简史 第310期:地下的烈火(18)

So all that can be said is that at some slightly indeterminate point as we head toward the center of Earth we leave the asthenosphere and plunge into pure mantle. 因此，我们只能说，在前往地球中心的过程中，我们会在某个不大确

万物简史 第309期:地下的烈火(17)

The hour hand on a clock moves about ten thousand times faster than the flowing rocks of the mantle. 钟面上时针的移动速度，比地幔岩石的流动速度，要快大约1万倍。 The movements occur not just laterally as the Earth's plates

万物简史 第306期:地下的烈火(14)

Because we can't see into the Earth, we have to use other techniques, which mostly involve reading waves as they travel through the interior. 我们无法看到地球的深处，因此不得不使用别的方法，主要包括观察波在地球内部的

万物简史 第298期:地下的烈火(6)

He had discovered the boundary between the crust and the layer immediately below, the mantle; 他发现地壳与下面一层即地幔的界线， this zone has been known ever since as the Mohorovicic discontinuity, or Moho for short. 此后，这个区

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