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Question

Carbon dioxide exists in Earth's atmosphere as a:

A
Metal
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B
Solid
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C
Trace gas
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D
Abundant gas
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Solution

The correct option is B Trace gas
Carbon dioxide exists in Earth's atmosphere as a trace gas at a concentration of about 0.04 percent (400ppm) by volume. A trace gas is a gas which makes up less than 1% by volume of the Earth's atmosphere.

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