Q. Which of the following are micro-organisms that can live within the pore interstices of sedimentary and even igneous rocks to depths of several kilometers?
Answer: Lithophiles
Notes: Micro-organisms that can live within the pore interstices of sedimentary and even igneous rocks to depths of several kilometers are referred to as Lithophiles. Some of these mico-organisms are known to live on surface rocks, and make use of photosynthesis for energy.