Earth Sciences


The biosphere is the layer of the planet that is formed by the parts of the Earth where life exists. It extends from the deepest root systems of trees, to the dark environment we can find in the deep ocean, the wonderful tropical forests and the high mountain peaks. Life exists in the soil, in the air as well as in the water and it is found in the biosphere. Although it is about 20 kilometers long, if you look at it from top to bottom, almost all life exists about 500 meters below the surface of the ocean and about 6 kilometers above sea level. It is a space full of materials and living beings that are powered and lived by sunlight. It is the most extensive layer of the earth's crust and in it there is water, air, soil and energy.


Related topics

Atmosphere, geosphere, hydrosphere

What is the biosphere?

The biosphere is the sphere of life. It is the part of the Earth where we can find life which develops through the sun's energy. All living beings, both simple and complex, make up the biosphere and it is found surrounding the globe along with other layers.

Characteristics of the biosphere

Among the most outstanding characteristics of the biosphere we can mention the following:

Structure of the biosphere

The structure of the biosphere has three different components: abiotic, biotic and energetic components.


Its layers are as follows:

Components of the biosphere

It is basically composed of water, soil and air. These three elements are necessary for habitats to survive, as are all living beings that inhabit the planet. It is also composed of carbon oxides, ecological systems that include biotic and abiotic factors, ecosystems, plants and animals.


The biosphere is the part that contains the planet’s life. One of its main functions is to maintain an adequate atmospheric balance in the earth, in addition to distributing life, since thanks to it we have a great diversity of plants and animals located in strategic areas for their proper functioning. It is the layer in which we find the food chains, fundamental for the survival of the different species that inhabit the planet.

Biosphere reserve

These are areas in which we find marine or terrestrial ecosystems that have been recognized by UNESCO and that serve to adequately integrate populations and nature by promoting adequate sustainable development, and in which solutions are sought to conserve biodiversity, economic development, research and education.


It has the function of promoting the conservation of landscapes, ecosystems, species and genetic variation; it also has a development function as it seeks to improve economic and human development in ways that are socio-culturally and ecologically sustainable; and finally it has a logistical function because it assists in research, education and the exchange of information related to local, national and global conservation and development issues.

Pollution of the biosphere and its consequences

Some activities developed by man affect and damage the biosphere. Disproportionate population growth, massive destruction of habitats for agriculture and urbanization, pollution, damage the environment. The consequences are serious, including the greenhouse effect that causes world temperatures to rise steadily; the ozone layer is slowly being destroyed, giving way to ultraviolet radiation that can damage plants, animals and humans; the acid rain that occurs when some fossils are burned, this rain contains sulfuric acid and nitric acid, which evaporate and return to the earth in the form of rain.


Some examples of biosphere reserves are:

Written by Gabriela Briceño V.

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