Multiple Choice
What significant evidence is there for the idea that large quantities of water once flowed on the planet Mars?
A) network of relatively straight canals linking polar and equatorial regions
B) clouds and frost that formed above and around the Viking spacecraft
C) frozen, dust-covered lakes inside ancient craters
D) winding channels resembling riverbeds carved into Mars's surface
Correct Answer:

Verified
Correct Answer:
Verified
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