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17. One explanation of why the planets near the Sun are composed mainly of rock and iron is that

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  • the Sun’s magnetic field attracted all the iron in the younger Solar System into the region around the Sun
  • the Sun is made mostly of iron. The gas ejected from its surface is therefore iron, so that when it cooled and condensed, it formed iron-rich planets near the Sun
  • The Sun’s heat made it hard for other substances such as ices and gases to condense near it
  • the statement is false. The planets nearest the Sun contain large amounts of hydrogen gas and subsurface water
  • the Sun’s gravitational attraction pulled iron and other heavy material inward and allowed the lighter material to float outward
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