Which of the following greenhouse gases is the most abundant in the Earth's atmosphere?Ozone (O3).Nitrous oxide (N2O).Methane (CH4).Carbon dioxide (CO2).

Carbon dioxide (CO2).

Step 1: Understanding Greenhouse Gases Greenhouse gases are gases in Earth's atmosphere that trap heat. They let sunlight pass through the atmosphere, but they prevent the heat that the sunlight brings from leaving the atmosphere. The main greenhouse gases are water vapor, carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and ozone (O3).

Step 2: Abundance of Greenhouse Gases Among the options given, carbon dioxide (CO2) is the most abundant greenhouse gas in the Earth's atmosphere. While water vapor is technically the most abundant greenhouse gas, it is not listed as an option in this question.

So, the answer to the question "Which of the following greenhouse gases is the most abundant in the Earth's atmosphere?" is Carbon dioxide (CO2).