Deep Biology

   The study of subsurface bacteria and similar organisms called Archaea.
   These life forms live in rock as deep as 4 kilometers (2.5 miles) below continental crust and 7 kilometers (4.3 miles) below oceanic crust. Life on Earth may have started here, since it would be protected from meteor bombardment and ultraviolet rays. There is a good chance that as much life lives below the surface of the Earth as above. This also shows that subsurface life may be alive and well on Mars and other planets or moons.

The writer's dictionary of science fiction, fantasy, horror and mythology. 2014.

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