Multiple Choice
Mercury's atmosphere is
A) almost nonexistent.
B) relatively dense, composed mostly of nitrogen (80 percent) and oxygen (20 percent) .
C) very thin, made up of sulfur dioxide and hydrogen sulfide from volcanoes.
D) relatively thin, composed of carbon dioxide with small quantities of nitrogen and argon.
Correct Answer:
Verified
Correct Answer:
Verified
Q4: Two observed features on Mars appear to
Q5: The density of Mercury is about the
Q6: Evidence of past water on Mars comes
Q7: The surface features and overall topology of
Q8: At greatest elongation, the Earth-Venus line makes
Q10: Craters on Mars have flatter bottoms and
Q11: What role has methane played in the
Q12: Spacecraft measurements indicate that the surface of
Q13: What is the observed feature that suggests
Q14: The origin of the Martian magnetic field