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OpenStudy (anonymous):

what is the atmosphere is composed of

OpenStudy (gabby2117):

mainly Oxygen

Awolflover1 (awolflover1):

Earth's atmosphere is 78% nitrogen, 21% oxygen, 0.9% argon, and 0.03% carbon dioxide with very small percentages of other elements. Our atmosphere also contains water vapor. In addition, Earth's atmosphere contains traces of dust particles, pollen, plant grains and other solid particles.~

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