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Comment: 26:01 - 26:43 (00:42)
Source: Annenberg/CPB Resources - Earth Revealed - 3. Earth's Interior
Keywords: "James Sadd", magnetism, gravity, geophysics, seismicity, "geologic history", goal, "geophysical research"

Our transcription: Linking magnetism, gravity, and seismicity with the geologic history of the Earth are goals of geophysical research.
By creatively using indirect evidence, these Earth scientists probe the Earth's interior for knowledge of structure, composition, and to locate valuable stores of natural resources as well.
Geophysics has forever changed our simple model of a three-layered Earth.
Without having actually seen it, we know that the interior of the Earth is remarkably complex in structure, in composition, in behavior.
Understanding that complexity will ultimately yield explanations for the origin of the Earth and for the tectonic forces that continuously change its face.

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