Q. In December 2015, NASA's Curiosity Mars rover found the presence of ____, which will help scientists learn about the ancient wet environment.
A) Cadmium
B) Magnesium
C) Calcium
D) Silica
✔ Correct Answer: Silica
Exam Insight
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A) Cadmium
B) Magnesium
C) Calcium
D) Silica
✔ Correct Answer: Silica
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