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The thickness of biosphere is

  • A.8-10 km above the earth's surface
  • B.5-8 km above the earth's surface
  • C.5-10 km above the earth's surface
  • D.10-12 km above the earth's surface

Answer: A

The biosphere is a thin shell, reaching about 8 to 10 km above the surface and a comparable distance into the ocean deeps.

Above that the air is too thin and cold, and the ultraviolet radiation too intense, for life to persist. Almost all living things in fact occupy a far narrower band close to the surface.

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