Earth's atmosphere is primarily made of

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Multiple Choice

Earth's atmosphere is primarily made of

Explanation:
The main idea here is identifying the most abundant gas in Earth's atmosphere. The atmosphere is dominated by nitrogen, which makes up about 78 percent by volume. That vast majority is why nitrogen is the correct answer. Oxygen is the next largest component, around 21 percent, and the remaining gases, including carbon dioxide, constitute only a small fraction (CO2 is about 0.04 percent). Free carbon as an element isn’t present in the atmosphere; carbon shows up mainly as CO2 and other compounds in trace amounts. So nitrogen stands out as the primary constituent.

The main idea here is identifying the most abundant gas in Earth's atmosphere. The atmosphere is dominated by nitrogen, which makes up about 78 percent by volume. That vast majority is why nitrogen is the correct answer. Oxygen is the next largest component, around 21 percent, and the remaining gases, including carbon dioxide, constitute only a small fraction (CO2 is about 0.04 percent). Free carbon as an element isn’t present in the atmosphere; carbon shows up mainly as CO2 and other compounds in trace amounts. So nitrogen stands out as the primary constituent.

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