9 EFFECTS OF LIVING ORGANISMS ON WEATHERING

9 EFFECTS OF LIVING ORGANISMS ON WEATHERING

These include; – vegetation cover (flora), Living organisms (fauna) like bacteria, fungi, termites and Earthworms.




The following are the effects of living organisms on the weathering process

  • Small plants (lichens) colonise bare rocks whose roots penetrate into rocks making cracks into them.
  • Vegetation cover breaks down and adds organic matter in the soil.
  • Plant roots penetrate the cracks in rocks and as they enlarge, they widen the cracks leading to breakdown of rocks
  • Some microorganisms like Rhizobia bacteria spp fix Nitrogen into the soil which enables plants to grow well.
  • The tips of plant roots secret chemicals which dissolve the mineral components of rocks, as a result rocks are weakened




  • Soil living organisms feed on organic matter thereby decomposing it
  • Large animals break down rocks as they walk over them
  • Organisms like termites and earthworms break down soft rocks and they also help in mixing underground soils with top soil and nutrient recycling
  • When living organisms die, they increase the organic matter content in the soil.

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