The atmosphere is the main reservoir for nitrogen, containing about 78% nitrogen gas (N2). While nitrogen is essential for life and cycles through soil and organisms, the vast majority of Earth's nitrogen is stored in the atmosphere, making it the primary reservoir, unlike sulfur, phosphorus, and calcium whose main reservoirs are primarily in rocks and minerals in the Earth's crust (lithosphere), from which soil is derived.
Biogeochemical cycle in which the main reservoir is not the soil
Asked in APPSC Group II Mains paper 2 2025 · Topic: Ecology (Biogeochemical Cycles: Carbon, Nitrogen, Phosphorus, Sulphur, Water)
More Environment and Ecology questions
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