QUIZ: Most Can’t Pass This Basic Science Test

Which of these elements is the reason Mars is called “The Red Planet”?

Retry Correct Incorrect Mars appears red because of iron oxide, which is the same compound that gives rust and blood their coloring. The planet has more than twice as much iron oxide in its outer layers than Earth does.

Which of these elements is the reason Mars is called “The Red Planet”?

  • Cadmium
  • Copper
  • Zinc
  • Iron
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