The correct sequence showing the increasing concentration of gases is Ozone, Carbon dioxide, Oxygen and Nitrogen. Ozone exists only in trace amounts, while carbon dioxide makes up about 0.04% of the atmosphere. Oxygen is much more abundant at 21% and nitrogen is the most prevalent gas at 78%. This specific hierarchy reflects the fundamental chemical composition of our planet’s air today. ANSWER: (C) Ozone, Carbon dioxide, Oxygen, Nitrogen
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Identifying the correct sequence of atmospheric gases requires understanding their relative volumes. Ozone is a trace gas found in very small quantities, mostly in the stratosphere. Carbon dioxide follows, currently making up approximately 0.04% of the air. Oxygen is a major component, occupying roughly 21% of the atmosphere and supporting most aerobic life. Finally, nitrogen is the most abundant gas, accounting for 78% of the total volume. This progression from trace elements to the primary nitrogen-oxygen mix defines the gaseous envelope surrounding Earth. This order is vital for scientific study, as it dictates how energy cycles through.
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