Mercury has only a trace atmosphere because
A) its close proximity to the Sun allows the Sun to gravitationally pull gases directly off the surface of Mercury.
B) impacts from planetesimals caused its original atmosphere to evaporate away.
C) its slow rotation allows atmospheric gases to escape the planet.
D) its smaller size means it has gravitational attraction that is too weak to hold onto an atmosphere.
Correct Answer:
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Q1: Which terrestrial planet is about one-third the
Q2: The Caloris Basin found on Mercury was
Q4: Which planet shows the largest variation of
Q5: The surface of Mercury resembles the Moon's
Q6: Of all the terrestrial planets, _ has
Q7: Mercury's average density is about as high
Q8: Mercury's crust
A) is molten because it is
Q9: Mercury features long, steep cliffs in its
Q10: What is the surface of Mercury like?
A)
Q11: Which surface feature of the Moon is
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