Oxygen is present in the atmosphere as 21% of volume (23% of mass) and in water as 89% (by mass).

Sedimentary cycles are those in which the main reservoir of nutrients is in the Earth's crust or rocks. Both sulfur and phosphorus cycles are of the sedimentary type, as their reservoir is in rocks and soil.

A bird named Guano is found in large quantities on the coasts of Peru in South America. The droppings of these birds contain large amounts of phosphorus, which is used to make agricultural land fertile.

Water cycle - Through the process of rain, water goes into the atmosphere and returns to water sources. This process includes evaporation, transpiration, condensation, precipitation, etc.

Nitrogen: Nitrogen was discovered by Daniel Rutherford in 1772. It is a colorless, tasteless, and odorless gas, highly soluble in water. It is found in 78% of the atmosphere (by volume). The nitrogen cycle mainly includes organic nitrogen, ammonium ions, nitrate ions, and nitrogen gas. Hydrogen sulfide is not a part of the nitrogen cycle.

The phosphorus cycle is a biogeochemical cycle, and these compounds are found in a solid state on the Earth in the presence of high temperature and pressure.

Biogeochemical cycles are of two types: (1) Gaseous cycle: e.g., Nitrogen cycle, carbon cycle, water cycle, and oxygen cycle. (2) Sedimentary cycle: e.g., Sulfur and phosphorus cycle.