The first function of water vapor in the earth's original atmosphere was to:
A) fall as rain and thus fill the oceans.
B) increase the amount of carbon dioxide in the atmosphere.
C) create oxygen.
D) provide needed nourishment for primitive plants.
E) block the solar wind.

Question

Quizplus · Accepted Answer

Water vapor eventually fell as rain and filled the oceans, creating the hydrological cycle and providing the necessary conditions for life to evolve on Earth.

The First Function of Water Vapor in the Earth's Original