Earth's earliest atmosphere was most likely composed of ____.
A)water vapor and nitrogen
B)carbon dioxide and helium
C)hydrogen and helium
D)hydrogen and oxygen
E)noble gases

Question

Quizplus · Accepted Answer

Earth's earliest atmosphere was most likely composed of hydrogen and helium, which are the most abundant elements in the universe. These gases were eventually lost to space due to Earth's relatively low gravity and the lack of a protective magnetic field in its early history.

Earth's Earliest Atmosphere Was Most Likely Composed of ____