The rover Opportunity photographed sand dunes on Mars,which showed the presence of millimeter-sized spheres of gray hematite.Why was this an important finding?
A) Such spheres naturally form in water-soaked deposits.
B) It shows that this rare form of iron can occur naturally.
C) Hematite only forms in the presence of bacteria.
D) They must have been produced in the clouds and fell from the sky.
Correct Answer:
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