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Comment: 02:00 - 02:37 (00:37)
Source: Annenberg/CPB Resources - Earth Revealed - 3. Earth's Interior
Keywords: geophysics, seismic, earthquake, temperature, "James Sadd", "magnetic field", magnetics, gravity, modeling

Our transcription: Fortunately, there is a great deal that we can learn about the Earth's interior without having to see it or sample it directly.
This branch of Geology, called Geophysics, uses indirect techniques to deduce the composition and behavior of the interior of the Earth.
These methods include studying seismic vibrations from earthquakes, analyzing variations in the Earth's temperature, magnetic field and gravity, and using laboratory and computer models to simulate conditions deep within the earth, and although these don't tell us everything we want to know about the Earth, the indirect approach of geophysical research has painted for us a remarkably detailed picture of the interior of our planet.

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