Unquestionably the interior of the earth is hot.

毫无疑问，地球内部是热的。

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Unquestionably the interior of the earth is hot .

毫无疑问，地球内部是热的。

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The electronics make the instrument bulky and hard to use in hot environments, like the interior of the Earth.

这些电子器件使地震仪变得笨重，难以在地球内部等炎热环境下使用。

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Plate tectonics, the formation of faults and the moving of the continental crust over a molten interior, is a characteristic unique to Earth and it meant that minerals evolved far beyond those on any other planet in the Solar System.

ECONOMIST: Minerals

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

According to tectonic theory, the surface of the Earth is made up of a patchwork of massive rigid plates, about 80km (50 miles) thick, which float in slow motion on top of the Earth's hot, pliable interior.

BBC: The Pacific 'Ring of Fire'