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Earthquakes provide information about the earth's interior chiefly because

  • A.wave velocities change with the properties of the material
  • B.the focus can be drilled into and sampled directly
  • C.each layer produces earthquakes of its own
  • D.magnitude varies with the depth of the layer

Answer: A

Refraction and reflection at boundaries, and the failure of shear waves to pass through liquid, revealed the layered structure and the liquid outer core. Seismology remains the principal means of probing depths no drill can reach.

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