Består av...

Biogeochemical cycle in the food chain

What is a biogeochemical cycle?

Producers and consumers

Consumers and decomposers

Producers and decomposers


Transformations of matter in a biogeochemical cycle

The hydrological cycle

Water circulation in the environment

Rates of water evaporation

Water circulation over oceans and land

The carbon cycle

The processes involved in the carbon cycle

Methane – another component of the carbon cycle

Oxygen cycle

Oxygen cycle and living organisms

Photosynthesis and respiration

Nitrogen cycle

The processes involved in the nitrogen cycle

Carnivorous plants

Nitrogen transformation by bacteria

Phosphorus circulation in the environment

The phosphorus cycle

Effects of artificial fertilizers

The stages of the phosphorus cycle

Economic applications of phosphate minerals