Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 395
ently grow and in-crease in number rapidly. The lichen thusobtains more and more food, quickly fills thetiny cleft, and begins to spread over the smoothsurface of the rock. Before long, the latter isentirely covered with the gray, yellow andbrown crusts of the different kinds. At firstthought, the… … Rock field, or talus, of angulatrocks split off from over-hanging cliffs by frostand ice. Talus, or gravel slide of rounded pebbles, formed by the crumbling of cliffs and boulders. effect of heat and cold. Lichens also form anacid which acts upon the rock surface andhastens the process which causes…
Children's literature
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