How many biosphere are there in earth

There are 5 main biospheres on Earth:

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1. *Lithosphere* (Land biosphere): includes all terrestrial ecosystems, such as forests, grasslands, and deserts.

2. *Hydrosphere* (Water biosphere): encompasses all aquatic ecosystems, including oceans, lakes, rivers, and wetlands.

3. *Atmosphere* (Air biosphere): includes all aerial ecosystems, such as the troposphere, stratosphere, and mesosphere.

4. *Pedosphere* (Soil biosphere): comprises all soil ecosystems, including the organisms that inhabit soil.

5. *Cryosphere* (Ice biosphere): includes all ecosystems associated with ice, such as glaciers, sea ice, and frozen ground.

Note that some sources may group these biospheres differently or recognize additional ones. However, the 5 listed above are the most commonly accepted.