Mercury's iron core takes up approximately what fraction of the mass of the planet?
A) about 32 percent, very similar to that of Earth
B) greater than 95 percent
C) about 60 percent
D) about 10 percent
Correct Answer:
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Q29: The planet with the highest overall density
Q30: The Caloris Basin, a huge circular region
Q31: When were most of the existing lava
Q32: The density of Mercury is about the
Q33: The Caloris Basin is an immense impact
Q35: What is the major difference between Mariner
Q36: How do astronomers know that the Caloris
Q37: The history of Mercury can be summarized
Q38: The impact that formed the Caloris Basin
Q39: What is the Caloris Basin?
A) lunar mare,
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