Natural Science CLEP Prep Practice Exam

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What is the main gas found in Earth's atmosphere?

Helium

Nitrogen

Nitrogen is the most abundant gas found in Earth's atmosphere, making up approximately 78% of the total composition. Helium is only a trace gas, making up less than 1% of the atmosphere. Carbon dioxide is also a trace gas, with a concentration of around 0.04%. Oxygen, although essential for life, only makes up about 21% of the atmosphere. Therefore, B is the main gas found in Earth's atmosphere.

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Carbon Dioxide

Oxygen

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