Geophysical cycle | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-05-05

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Biogeochemical_cycle


00:00:48 1 Systems
00:03:20 2 Reservoirs
00:04:29 3 Important cycles



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SUMMARY
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In ecology and Earth science, a biogeochemical cycle or substance turnover or cycling of substances is a pathway by which a chemical substance moves through biotic (biosphere) and abiotic (lithosphere, atmosphere, and hydrosphere) compartments of Earth. There are biogeochemical cycles for the chemical elements calcium, carbon, hydrogen, mercury, nitrogen, oxygen, phosphorus, selenium, and sulfur; molecular cycles for water and silica; macroscopic cycles such as the rock cycle; as well as human-induced cycles for synthetic compounds such as polychlorinated biphenyl (PCB). In some cycles there are reservoirs where a substance remains for a long period of time (such as an ocean or lake for water).