Question

About how thick is the biosphere?

Answer 1

The biosphere is the space on or near Earth's surface that contains and supports living organisms. It is subdivided into the lithosphere, atmosphere, and hydrosphere. The lithosphere is Earth's surrounding layer, composed of solids such as soil and rock; it is about 80 to 100 kilometers (50 to 60 miles) thick.

Answer 2

According to scientists biosphere is nearly 20 kilometers thick.

Biosphere is the place where all the known living beings live. It is comparatively thin. It extends from the depths of the ocean to the hill tops.  Almost all the life exists between $500$ meters depth of ocean and $6$ kilometers above the sea level.

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