The movement of phosphorus atoms from rocks through the biosphere and hydrosphere and back to rocks is called which cycle?

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Multiple Choice

The movement of phosphorus atoms from rocks through the biosphere and hydrosphere and back to rocks is called which cycle?

Phosphorus cycling is the movement of phosphorus through rocks, soils and waters into living organisms, and back into rocks or sediments. This description fits best because phosphorus has no significant gaseous phase at the Earth’s surface, so it cycles mainly through solid or dissolved forms rather than circulating in the atmosphere. Plants take up phosphate from water and soil, organisms reuse it in DNA, RNA, and ATP, and when organisms die or waste products decompose, phosphorus is returned to sediments or rocks, where geological processes can re-expose it to weathering and continue the cycle. In contrast, the other cycles involve substantial atmospheric components: the nitrogen cycle relies on atmospheric N2 and fixation, the carbon cycle exchanges carbon between the atmosphere and living things, and the sulfur cycle includes gaseous sulfur compounds.

Phosphorus cycling is the movement of phosphorus through rocks, soils and waters into living organisms, and back into rocks or sediments. This description fits best because phosphorus has no significant gaseous phase at the Earth’s surface, so it cycles mainly through solid or dissolved forms rather than circulating in the atmosphere. Plants take up phosphate from water and soil, organisms reuse it in DNA, RNA, and ATP, and when organisms die or waste products decompose, phosphorus is returned to sediments or rocks, where geological processes can re-expose it to weathering and continue the cycle. In contrast, the other cycles involve substantial atmospheric components: the nitrogen cycle relies on atmospheric N2 and fixation, the carbon cycle exchanges carbon between the atmosphere and living things, and the sulfur cycle includes gaseous sulfur compounds.

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