. Elements of agriculture, southern and western. Agriculture; Agriculture. THE MAKIN(; OF THE SOIL 9 How the Rock was ground up. — (ieology, the science Avliich teaches the past history of the earth, tells us some interesting stories about how the soil was made. The surface of the earth was at first covered with melted rock, surrounded by air containing water vapor, as we find the i^^i^. ?4^f.''^'"'t--% ^:^^'- Fig. 2. — Weathering of Rock, forming Soil air to-day. As the vapor high in the air became cold, it formed rain, which fell on the hot rock. Of course the rain cooled the rock and c
. Elements of agriculture, southern and western. Agriculture; Agriculture. THE MAKIN(; OF THE SOIL 9 How the Rock was ground up. — (ieology, the science Avliich teaches the past history of the earth, tells us some interesting stories about how the soil was made. The surface of the earth was at first covered with melted rock, surrounded by air containing water vapor, as we find the i^^i^. ?4^f.''^'"'t--% ^:^^'- Fig. 2. — Weathering of Rock, forming Soil air to-day. As the vapor high in the air became cold, it formed rain, which fell on the hot rock. Of course the rain cooled the rock and cracked it. As the rain water was heated, it rose in steam, and reaching the higher air, grew cold, and was again condensed into rain. Aofain it fell and cooled and cracked the rocks still more. Finally the rocks became cool enough for the rain to form little streams, and to wash and grind the little pieces of broken rock, and separate the coarser from the finer pieces. As the whole surface of the earth cooled, mountains and valleys, hills and hollows, were formed. Many large cracks, or seams, Avere also made in the earth's Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Welborn, W. C; Ness, H; Sanborn, Charles Emerson, 1877-; Marstellar, R. P. New York, The Macmillan company
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Keywords: ., bookcentury1900, bookdecade1900, bookpubl, booksubjectagriculture
