Multiple Choice QuestionGreenhouse gases make up Blank______% of the atmosphere.Multiple choice question.more than 10<0.1about 5

Break Down the Problem

1. Identify the options provided in the multiple choice: "more than 10", "0.1", and "about 5".
2. Understand the context of the question regarding greenhouse gases in the atmosphere.

Relevant Concepts

1. Greenhouse gases, including carbon dioxide, methane, and nitrous oxide, contribute to the Earth's greenhouse effect.
2. The concentration of these gases is usually measured as a percentage of the total atmosphere.

Analysis and Detail

1. Greenhouse gases constitute a very small fraction of the atmosphere.
2. To clarify:
   • The concentration of carbon dioxide, for example, is around 0.04% (400 ppm) of the atmosphere.
   • The total percentage for all greenhouse gases combined is considerably less than 10%, often cited as around 1% or lower.

Verify and Summarize

1. Considering the options, "more than 10%" is clearly too high.
2. The "0.1%" option is plausible but does not account for the various greenhouse gases collectively.
3. "About 5%" is an overestimate but more realistic than 0.1%.

Final Answer

The correct choice is 0.1%, meaning greenhouse gases make up less than 0.1% of the atmosphere when considered collectively.