Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 394
They make numberless invisible cracks, whichloosen the particles of the rock and cause thelatter to crumble into fine dust. This actioncan not be followed by the eye, but evidencesof it are seen in the fine powder which accumu-lates in the clefts. It takes place with extremeslowness and would seem… … Surface of an overhanging ledge covered with lichens. The latter, growing upon the hardest granite, cause the surface to crumble to fine dust. tance whatever. Yet it is this process that en-ables the pioneer plants to secure a foothold.The tiny cracks with the aid of their pinch ofsoil catch and…
Children's literature
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