The most abundant gases in the earth's present day atmosphere (by volume) are ____.

Name: The most abundant gases in the earth's present day atmosphere (by volume) are ____.
Brand: Quizplus
Rating: 4.9 (53 reviews)

Question

Quizplus · Accepted Answer

The earth's atmosphere is composed mainly of nitrogen (78%) and oxygen (21%). Carbon dioxide and water vapor, although important greenhouse gases, make up a very small fraction of the atmosphere (0.039% and 0.25%, respectively). Helium is also present in trace amounts. Therefore, choice C is the best option.

The Most Abundant Gases in the Earth's Present Day Atmosphere