Final answer:
The Earth's atmosphere is primarily composed of Nitrogen, Oxygen, and Argon, with Nitrogen being the most abundant at 78%, followed by Oxygen at 21%, and Argon at 0.93%.
Step-by-step explanation:
The three gases that make up the majority of the Earth's atmosphere are Nitrogen, Oxygen, and Argon. Nitrogen is the most abundant gas in the atmosphere, making up about 78% of the air. Oxygen is the second most abundant, comprising around 21% of the atmosphere. Argon, although significantly less prevalent than nitrogen and oxygen, still constitutes about 0.93% of the atmosphere. Minor constituents like carbon dioxide (which is about 0.04% and increasing), neon, helium, methane, and other gases make up the remaining percentage. Therefore, the correct answer to the question about the three gases that make up Earth's atmosphere is option A) Nitrogen, Oxygen, and Carbon Dioxide, although it should be noted that Argon is more abundant than Carbon Dioxide but is still considered a minor component compared to Nitrogen and Oxygen.
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