Biosphere

The outer layer of the planet Earth can divididirse in different compartments: the hydrosphere (or sphere of water), the lithosphere (or sphere of soils and rocks), and the atmosphere (or the area of air). The biosphere is the living matter on the planet. It reaches in the other three areas, although there are no permanent inhabitants of the atmosphere. In relation to the volume of the Earth, the biosphere is only the very thin surface layer that extends 11,000 meters under the sea level at 15,000 meters above. It is usually thought that life first developed in the hydrosphere, at shallow depths in the photic zone.

(However, currently it is estimated that life originated around hydrothermal sources deep in the Ocean). Then, in time, multicellular organisms appeared and colonized benthic zones. Photosynthetic organisms were issued, through chemical reactions, gases up to current concentrations, especially the abundance of oxygen, that characterize our planet. Life on Earth It developed later, protected from UV radiation by the ozone layer. The diversification of terrestrial species is thought it was increased by the drift of continents separately or, at least, alternately, colliding. Biodiversity is expressed at the ecological level (ecosystem), at the level of population (intraspecific diversity), species (species diversity), and genetic level. The Biosphere has large amounts of elements such as carbon, nitrogen, hydrogen and oxygen. Other elements, such as phosphorus, calcium and potassium, are also essential for life, yet are present in smaller amounts. In the ecosystem and Biosphere levels, is a permanent recycling of all these elements, which alternate between the mineral and organic States. If you want to learn more about partial discharge partial discharge enter in original author and source of the article