Lichens are called pioneer colonizers of bare rock. How can they help in the formation of soil?

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Solution

Lichens grow over the crevices of bare rock and release chemicals ( acid ) which in turn break the rock into small pieces.
Further, these pieces turn into soil.

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Lichens are called pioneer colonizers of bare rock. How can they help in the formation of soil?

Lichens grow over the crevices of bare rock and release chemicals ( acid ) which in turn break the rock into small pieces. Further, these pieces turn into soil.

Lichens grow over the crevices of bare rock and release chemicals ( acid ) which in turn break the rock into small pieces.
Further, these pieces turn into soil.