Oxygen, Phosphorous, Sulfur Cycle

Oxygen Cycle

the biogeochemical cycle that describes the continuous movement of oxygen atoms through the Earth's atmosphere, biosphere (living organisms), and lithosphere (Earth's crust). It is a vital loop that ensures oxygen is constantly recycled to sustain life.

Phosphorus Cycle

A slow, land-based biogeochemical process describing the movement of phosphorus through the lithosphere, hydrosphere, and biosphere. It lacks a gaseous phase, so it does not cycle through the atmosphere. Instead, it primarily cycles through rocks, soils, water, and living organisms to support critical biological functions.

Sulfur Cycle

The biogeochemical process that describes the movement of sulfur through the earth's lithosphere, atmosphere, and biosphere. It is vital for life because sulfur is an essential component of amino acids and proteins. The cycle is mainly driven by microbial activity, which converts sulfur between various organic and inorganic forms.

Sulfur Dioxide

Gas released into the air by volcanoes and burning fossil fuels.

Decomposition

The process where bacteria break down dead organisms to return sulfur to soil.

Mineralization

Microbial conversion of organic sulfur from dead matter into inorganic forms plants can use.

Weathering

The breaking down of rocks by rain and wind, which releases phosphorus.

Sedimentation

The settling of phosphorus at the bottom of oceans, forming new rock over ages.

Photosynthesis

The process where plants use sunlight to turn carbon dioxide into oxygen.

Oxidation

Uses oxygen to break down organic compounds and release energy.