The outer shell of the planet Earth can be divididir in different compartment: the hydrosphere (or water sphere), the lithospere (or scope of grounds and rocks), and the atmosphere (or the air sphere). The biosphere is the alive matter of the planet. It reaches thus in the other three scopes, although there are no permanent inhabitants of the atmosphere. In relation to the volume of the Earth, the biosphere is only the very thin superficial layer that superficially extends 11,000 meters under the level from the sea to 15,000 meters. One thinks habitually that the life was developed for the first time in the hydrosphere, to brief depths, in the ftica zone. (Nevertheless, at the moment esteem that the life was originated around hidrotermales sources in the depth of the ocean). Then, in the time, they appeared the multicellular organisms and they colonized the bentnicas zones. Photosynthetic organisms emitted, by means of chemical reactions, the gases until arriving at the present concentrations, especially the abundance of oxygen, that characterize to our planet.

The life terrestrial it was developed then, protected of rays UV by the ozone layer. The diversification of the terrestrial species thinks that it was increased by the drift of the continents by aside or, at least, alternatively, to hit. The biodiversity is expressed at ecological level (ecosystem), concerning population (intraspecific diversity), in the species (specific diversity), and at genetic level. The biosphere owns great amounts of elements such as carbon, nitrogen, hydrogen and oxygen. Other elements, such as the phosphorus, calcium and potassium, also are essential for the life, still are presents in smaller amounts. In the ecosystem and the levels of the biosphere, it is a permanent recycling of all these elements, that are alternated between the mineral and organic states. If it wishes to know more information on partial unloadings partial unloadings enter in Original author and source of the article