Astronomers believe that Mars formed with a much thicker atmosphere than it has today. Where did this atmosphere go?
A) it escaped into space (and some later froze out as Mars got cold)
B) it was absorbed by the rocks on Mars, which are much more absorbent than on Earth
C) it was drawn into the crust and mantle of Mars through the enormous cracks of the Mariner Valley canyon system
D) it is trapped in bubbles inside the rocks on the martian surface
E) no one has any good theories about this; it is an unsolved mystery
NOTE: Section 10.6 is just a short summary, so there are no questions for it.
Correct Answer:
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