Mains Paper II · 4 Environment & Ecology · APPSC Group 2
4.2 Biogeochemical cycles notes
4 notes, in reading order.
- 4.2.1Biogeochemical cycles: gaseous and sedimentary types and the water cycle
Nutrients move in cycles between living things and the air, water and rocks; in gaseous cycles the main store is the air or ocean, and in sedimentary cycles it is the Earth's crust.
Advanced · 7 min · Full course - 4.2.2Carbon cycle and carbon sinks
Carbon moves between air, living things, oceans, soils and rocks; plants and oceans take it up, while respiration, decay and the burning of fossil fuels return it, and human emissions have upset the balance.
Advanced · 7 min · Full course - 4.2.3Nitrogen cycle: fixation, nitrification and denitrification
Nitrogen gas makes up most of the air but most organisms cannot use it; microbes, lightning and industry convert it into usable compounds, and other microbes return it to the air.
Advanced · 7 min · Full course - 4.2.4Phosphorus and sulphur cycles
Phosphorus and sulphur follow sedimentary cycles with their main stores in rocks; phosphorus has no significant gas phase, while sulphur passes through the air as sulphur dioxide and hydrogen sulphide.
Advanced · 8 min · Full course
Practise Biogeochemical cycles. Questions with answers explained, from the same topics.
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