Which Statement BEST Describes Our Current Understanding of the Valles

question 175

Multiple Choice

Which statement BEST describes our current understanding of the Valles Marineris?

• A) The valley system appears to have been carved almost entirely by water flowing toward the lowlands from the geological rise near Olympus Mons.
• B) The valley system appears to be a set of parallel subduction trenches along the boundary where the northern lowlands are colliding with the southern highlands.
• C) The valley system appears to have formed entirely by cracking and faulting of the Martian surface, without noticeable intervention of erosion by water.
• D) The valley system formed primarily by cracking and faulting of the Martian surface, but some valleys at the eastern end appear to have been carved by water.

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