Past Gas on Mars. Models suggest that Mars today could haveliquid water on its surface

Chapter 8, Problem 55

(choose chapter or problem)

Past Gas on Mars. Models suggest that Mars today could haveliquid water on its surface if the atmosphere were about 400times as dense as it actually is. What would the atmosphericmass be in that case? How does this compare to the presentmass of Earths atmosphere? Does it seem plausible that Marsmight once have had this much gas? Explain why or why not.

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