Which of the following combinations of gases describes the primary composition of the Earth's first atmosphere?
A)oxygen and water vapour
B)argon and nitrogen
C)carbon dioxide and water vapour
D)hydrogen and helium

Question

Quizplus · Accepted Answer

The Earth's first atmosphere was primarily composed of hydrogen and helium, which are the lightest and most abundant elements in the universe. This early atmosphere was formed from the solar nebula, the cloud of gas and dust from which the solar system condensed.

Which of the Following Combinations of Gases Describes the Primary