Valles Marineris on Mars is thought to be a rift valley,a feature created when a planet's crust breaks apart a fault line.
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Q4: Mars has a thin,almost cloudless atmosphere that
Q5: Naked-eye observations of Mercury are best made
Q6: Venus's atmosphere is extremely hot and dense.
Q7: Opposite the Caloris Basin,a huge crater on
Q8: Venus appears almost completely featureless with neither
Q10: No spacecraft have successfully landed on the
Q11: Venus has a relatively thin crust that
Q12: Mars's atmosphere experiences a runaway icehouse effect
Q13: Hot-spot volcanoes on Earth are only found
Q14: Mercury's scarps,numerous long cliffs,were probably formed as
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