Nitrogen makes up about 78% of the Earth’s atmosphere, making it the most abundant gas by volume. Oxygen is about 21%, while Argon and Carbon Dioxide make up much smaller fractions. This question falls under General Science → GK because it tests basic environmental and atmospheric knowledge.
The most abundant gase in the earth's atmosphere by volume is _____?
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Question context
This question is part of 🔬 General Science within the broader 🌐 Current Affairs & GK subject and appears in the ASF Airports Security Force preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.