Which gas constitutes the greatest proportion of Earth's atmosphere?
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Answer: A. Nitrogen
Explanation
Nitrogen gas accounts for approximately seventy-eight percent of the total volume of Earth's atmosphere. It remains abundant because it is a relatively inert gas that does not easily react with other elements. This high atmospheric concentration provides a stable gaseous buffer surrounding all terrestrial life forms. Earth's atmosphere is a complex mixture of various gases held in place by planetary gravitational forces. Atmospheric nitrogen plays a crucial role in the global biogeochemical cycle despite most organisms needing fixation. Specialized soil bacteria convert atmospheric nitrogen into usable ammonia compounds that plants absorb for growth.
Hydrogen is an extremely light gas that escapes Earth's gravity easily and exists only in trace atmospheric amounts. Nickel is a heavy metallic solid found in Earth's crust rather than a gaseous component of the atmosphere. Oxygen constitutes approximately twenty-one percent of the atmosphere, making it the second most abundant atmospheric gas.
- Subject
- Everyday Science
- Category
- Everyday Science
- Topic
- —
- Difficulty
- medium
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