Outgassing and ____ are probable sources for Earth's early water vapor.
A)solar wind
B)icy comets
C)photochemical dissociation
D)land plants
E)the ozone layer

Question

Quizplus · Accepted Answer

Icy comets are thought to have collided with the early Earth, bringing water vapor and other volatile compounds with them. Outgassing from volcanic activity is another possible source of Earth's early water, but it is not listed as a choice.

Outgassing and ____ Are Probable Sources for Earth's Early Water