This unit illustrates the interior of the Earth. Although the deepest borehole ever drilled — the Kola well in Russia — penetrated only about 0.2% of the Earth's depth, geophysicists have mapped internal structures and layers throughout the planet using data from earthquakes, gravity, heat flow, electrical currents produced by lightning storms and the Earth's magnetic field. Combined with knowledge of the materials found in volcanic rocks and meteorites, these studies inform our understanding of the processes occurring deep within the Earth.

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