If Venus once had an ocean, where did it go?
Answer: a. It exists as abundant water vapor in the planet's atmosphere.
b. It was lost to space.
c. The water broke into hydrogen, which escaped to space, and oxygen, which became trapped in the planet's surface rocks.
d. It exists trapped in the crust but below the surface.
e. It is all frozen, in the form of large polar ice caps.
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