Describe how lichens and big trees influence the formation of soil.

Q. Describe how lichens and big trees influence the formation of soil. 
Ans. (i) Lichens grow on the surface of rocks and release substances that powder down the rock surface.
(ii) Moss grows on this surface and breaks it further.
(iii) The roots of trees grow into rocks, form cracks and widen them further to form soil.

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