1. Education
Send to a Friend via Email

Weathering by Lichens

Organic or Biological Weathering Gallery

By

Lichens combine mechanical weathering by rootlets and chemical weathering by humic acids to break down bare rock into the beginnings of soil.
Primary producers of soil
Photo (c) 2000 Andrew Alden, licensed to About.com (fair use policy)
Top Related Searches

©2014 About.com. All rights reserved.