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MMLU / The terrestrial planet cores contain mostly metal because

Problem

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question

The terrestrial planet cores contain mostly metal because

choices

  1. the entire planets are made mostly of metal.
  2. metals condensed first in the solar nebula and the rocks then accreted around them.
  3. metals sank to the center during a time when the interiors were molten throughout.
  4. radioactivity created metals in the core from the decay of uranium.

subject

astronomy

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