He discussed the propagation of waves through the earth's interior.

他探讨了地震波在地球内部的传播。

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If If a volcano erupts, some of the Earth's interior heat will escape to the surface.

如果火山爆发，地球内部的一些热量就会逃逸到地球表面上来。

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The water is kept liquid by natural geothermal heat coming from the Earth's interior.

地球内部的天然地热使湖水保持液态。

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Those created in the atmosphere on the other side of the world, which then had to make the 20, 000km (12, 000 mile) journey through the earth's interior to get to Japan, would have had a chance to turn their coats.

ECONOMIST: Neutrinos

Here's one example why we should care: in 1977, diving in the human occupied vehicle Alvin, scientists investigating a volcanic ridge 2500 m (1.5 miles) below sea-level found something totally unexpected -- lush ecosystems thriving at hydrothermal vents fueled by chemical energy released from the Earth's interior.

CNN: Probing the ocean's undiscovered depths

Given all the discoveries that we have made from an up-close investigation of these ocean ridges, we can't help but wonder what we might find at the far end of the same plate tectonic cycle where seafloor is drawn back into the Earth's interior at deep-ocean trenches.

CNN: Probing the ocean's undiscovered depths