Through which process is argon generated in the Earth's crust?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. Radioactive decay of potassium-40
Argon in the Earth's crust, specifically argon-40, is primarily produced through the radioactive decay of potassium-40 (K-40). Potassium-40, a naturally occurring isotope, decays over time into argon-40 and calcium-40. This process contributes to the accumulation of argon gas trapped in rocks and minerals and is also used in K-Ar dating to determine the age of geological samples.
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Evaporation of seawater – Produces salts and minerals, not argon.
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Photosynthesis in plants – Produces oxygen, not argon.
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Combustion of fossil fuels – Releases CO₂ and pollutants, not argon.