The runoff channels on Mars were most likely formed by:
A)melting underground ice.
B)catastrophic, but rare flooding.
C)the annual melting of the polar ice caps.
D)glaciers.
E)rain that was part of a water cycle.

Question

Quizplus · Accepted Answer

The distinctive features of the Martian runoff channels, such as their large size and the presence of debris deposited alongside them, suggest that they were formed by catastrophic flooding rather than by gradual processes such as melting ice or rainfall. While there is evidence of water on Mars, the planet's thin atmosphere and cold temperatures would make it difficult for rain to persist on the surface. The channels on Mars are much larger than any that are found on Earth, indicating that they were formed by massive floods, most likely caused by the release of large amounts of water from underground reservoirs. Melting ice or glaciers could not account for the size and extent of these channels. There is currently no evidence of an active water cycle on Mars, so rain is not a likely explanation. While there is evidence of seasonal changes in the polar ice caps, this would not be enough to create such large channels.

The Runoff Channels on Mars Were Most Likely Formed By