. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. 6 THE SOIL AND ITS ORIGIN Rock Weathering the SoU-forming Process.—The formation of soil is the result of the slow process of rock weathering, meaning the breaking up and decay of rocks brought about by the destruc- tive action of the forces of nature. These forces include: (a) Heat and cold—causing cracking and splitting of rocks through sudden temperature changes. (6) Frost—causing splitting and cracking by freezing Fig. 2.—Sugar Bowl Rock, Dells of the Wisconsin River. Water wea
. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. 6 THE SOIL AND ITS ORIGIN Rock Weathering the SoU-forming Process.—The formation of soil is the result of the slow process of rock weathering, meaning the breaking up and decay of rocks brought about by the destruc- tive action of the forces of nature. These forces include: (a) Heat and cold—causing cracking and splitting of rocks through sudden temperature changes. (6) Frost—causing splitting and cracking by freezing Fig. 2.—Sugar Bowl Rock, Dells of the Wisconsin River. Water wears away and helps to disintegrate rocks. (c) Wind—causing abrasion through the action of dust and sand particles carried by it. (d) Ice—causing grinding as in glacial action. (e) Water—a wearing and dissolving agent, also producing chemical changes^ (Figs. 2 and 3.) Oxygen,^ producing chemical changes, (/) Gases—^ Carbon dioxide, or carbonic acid gas, producing ( chemical changes. 2 Chemical changes are the decay processes in rock weathering. ^ Oxygen is a gas composing per cent of the air. Carbon dioxide is a heavy gas consisting of the elements carbon and oxygen (CO2).. 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 Weir, Wilbert Walter, 1882-. Philadelphia London, J. B. Lippincott company
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsoils, bookyear1920
