What chemical gas serves as the primary constituent of Earth's atmosphere ___________?
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Answer: B. Nitrogen
Explanation
Nitrogen is the most abundant chemical gas present within the lower layers of Earth's atmosphere. It accounts for approximately seventy-eight percent of the total volume of dry atmospheric air. This high concentration makes nitrogen the primary foundational constituent surrounding our planet every day. Atmospheric nitrogen exists primarily as a stable diatomic molecule consisting of two bonded nitrogen atoms. Although abundant, atmospheric nitrogen must be fixed by specialized bacteria before plants can utilize it. The remaining atmospheric composition consists largely of oxygen, argon, and trace amounts of carbon dioxide.
Nitrogen gas acts as an inert buffer that moderates combustion rates and chemical reactions on Earth. Industrial processes use liquid nitrogen for cryogenic freezing applications in scientific laboratories and food industries. Understanding atmospheric chemistry is essential for modeling global climate systems and weather prediction patterns. Oxygen is the second most abundant gas in our atmosphere, making up roughly twenty-one percent of air. Hydrogen is extremely rare in Earth's atmosphere because its low molecular weight allows it to escape gravity. Helium is a noble gas present only in trace atmospheric concentrations originating from radioactive decay underground.
- Subject
- Everyday Science
- Category
- Everyday Science
- Topic
- —
- Difficulty
- medium
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