Mercury may have ice trapped in the crater floors near the planet's north pole.
Correct Answer:
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Q1: Mercury is still geologically active today.
Q2: Aside from Earth, the lunar maria is
Q4: Since there are no folded mountain chains
Q8: Because of Mercury's lower gravity, ejecta from
Q10: Mercury is more than 60 percent denser
Q14: The lunar rocks brought back by the
Q16: Mercury completes one orbit around the Sun
Q17: Most of the craters on the Moon
Q18: What does "maria" mean?
A) plateaus
B) ponds
C) rivers
D)
Q19: Between July 1969 and December 1972, 17
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