The Martian valley Valles Marineris is shown in Figure 8-27 of the text. How long is this valley in terms of Earth distances? 
A) half the length of Earth's equator, about 20,000 km
B) about 50 km, a significant distance on this small planet
C) a few hundred kilometers-New York to Washington, DC
D) the full width of the North American continent at midlatitudes-a few thousand kilometers
Correct Answer:
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