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MMLU / Which of the following has provided the most information about the structure of…

Problem

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question

Which of the following has provided the most information about the structure of Earth's core, mantle, and lower crust?

choices

  1. Measurement of the intensity and fluctuations of Earth's magnetic field
  2. Examination of flowing lava
  3. Collection of samples from deep boreholes drilled into Earth
  4. Studies of the speeds and travel paths of seismic waves passing through Earth

subject

miscellaneous

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