Biosphere is an area where the influence of life activities on the earth occurs and is felt. It is the general name of surface organisms including microorganisms and their bottom-up environment, and it is a unique circle of planet earth. It is also the space where human beings are born and live. The biosphere covers the bottom of the atmosphere, most of the hydrosphere and the surface of the lithosphere.

If the temperature range of life can be defined as the biosphere, it is between-100 degrees Celsius and 100 degrees Celsius. The area where the ambient temperature around the star is within this range is called the biosphere where life can live.

To some extent, these two meanings are the same.

Biosphere (also known as biosphere) is the largest ecosystem on the earth's surface, which consists of the lower atmosphere, hydrosphere, soil lithosphere and creatures living in it. In the long-term evolution of the earth, different spheres such as atmosphere, hydrosphere and soil lithosphere have been formed. These three spheres overlap, penetrate and interact with each other, forming an environment suitable for living things. Living things depend on the material and solar radiation energy provided by the three circles for survival and development, and constantly transform the composition and properties of each circle in the process of development. The three inanimate physical spheres on the earth's surface form a biosphere only after the emergence of living things and the mutual infiltration of active life. Biosphere refers to the whole of all life on the earth and its living environment. It goes up to the stratosphere and down to the earth's crust for more than ten kilometers, forming a living envelope. In fact, the vast majority of creatures live in the range of about 100 meters above the land and below the ocean surface. The biosphere can be formed on the earth because there are four conditions for life in such a thin layer: sunlight, water, suitable temperature and nutrients. In a word, all the places where life exists on the earth belong to the biosphere. The most striking feature of the biosphere is its integrity, that is, the life phenomenon anywhere is not isolated, and it has historical and realistic ties with the rest of the biosphere. How big is the biosphere? The height of 23km upward from the earth's surface and the depth of 1 1km downward (the deepest trough in the Pacific Ocean) belong to the biosphere.

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