. Jefferson, Berkeley, and Morgan counties, by Grimsley, assistant geologist. White, state geologist. PLATE XXXIII(A).—Harland Spring under Hill of Conococheague PLATE XXXIII(B).—Old Natural Cement Kiln (1830) Shepherdstown. WEST VIRGINIA GEOLOGICAL SURVEY. 513 of the earth is water with its included gases and acids. Whatis termed pure water in the earths surface or crust is pureonly by comparison. Even the water as it falls from the cloudsand before it reaches the earth is impure, containing gases anddust. These included gases are powerful agents of changeand their powe
. Jefferson, Berkeley, and Morgan counties, by Grimsley, assistant geologist. White, state geologist. PLATE XXXIII(A).—Harland Spring under Hill of Conococheague PLATE XXXIII(B).—Old Natural Cement Kiln (1830) Shepherdstown. WEST VIRGINIA GEOLOGICAL SURVEY. 513 of the earth is water with its included gases and acids. Whatis termed pure water in the earths surface or crust is pureonly by comparison. Even the water as it falls from the cloudsand before it reaches the earth is impure, containing gases anddust. These included gases are powerful agents of changeand their power is augmented by increase in amount on con-tact with the earth. The water now reaching the earth becomes an activegeological and chemical agent, both by direct wear on therocks termed corrasion, and by its chemical action or corro-sion. The gases and acids especially important in water asa chemical agent of change are carbonic acid (C02), oxygen,sulphur in form of sulphurous acid, the humus or vegetableacids. Clay from a chemical point of view is kaolin plus a greateror less amount of impurities. A chemically pure clay wouldbe a pure kaolin with the following chemical compos
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeology, bookyear1916
