पृथ्वी के वायुमण्डल में कौन-सा तत्त्व प्रचुर मात्रा में है? Which element is in the abundant quantity in the atmosphere of earth?

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पृथ्वी के वायुमण्डल में कौन-सा तत्त्व प्रचुर मात्रा में है? Which element is in the abundant quantity in the atmosphere of earth?