Mercury's scarps,numerous long cliffs,were probably formed as the planet cooled and contracted.
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Q9: Valles Marineris on Mars is thought to
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
Q15: Jupiter's moon,Io,may have as many as 300
Q16: Mars's atmosphere has always been thin and
Q17: X-rays were used to map the surface
Q18: An impact crater will always reproduce the
Q19: Venus's craters are uniformly scattered across the
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