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Which planet is mostly made up of iron and covered with craters?

Which planet is mostly made up of iron and covered with craters?

کون سا سیارہ زیادہ تر لوہے سے بنا ہے اور گڑھوں سے ڈھکا ہوا ہے؟
Explanation
  • Mercury is mostly made up of iron.
  • It's surface covered with craters.
  • It has no atmosphere and no moons.
  • It's closest to the sun.
  • It's smallest planet.