What evidence supports Venus having lost large quantities of water in the past?
A)Large erosion features on the surface.
B)Signs of water below the surface.
C)High atmospheric concentrations of deuterium relative to ordinary hydrogen in the atmosphere.
D)Observation of dry lake basins.

Question

Quizplus · Accepted Answer

High atmospheric concentrations of deuterium relative to ordinary hydrogen in the atmosphere suggest that Venus has lost a significant portion of its original water content. This is because deuterium (heavy hydrogen) is more likely to escape from a planet's atmosphere due to its heavier mass.

What Evidence Supports Venus Having Lost Large Quantities of Water