. Dairy farming : being the theory, practice, and methods of dairying. Dairy farms; Dairy plants; Milk plants. 94 DAI IIV FARMING. tlie mouth, while the lia^hter particles are carried farther out, and the finest sediment farthest (jf all. It is because of this deposition of sediment that the Rhone, which, as has already been stated, enters the Lake of Geneva as a muddy stream fed by glaciers, emerges therefrom as a river of clear, ))ellucid water. Deltas, such as those of the Nile and Ganges, and the delta of the Rhine which forms most of the flat Dutch country, are formed in this way. If, how
. Dairy farming : being the theory, practice, and methods of dairying. Dairy farms; Dairy plants; Milk plants. 94 DAI IIV FARMING. tlie mouth, while the lia^hter particles are carried farther out, and the finest sediment farthest (jf all. It is because of this deposition of sediment that the Rhone, which, as has already been stated, enters the Lake of Geneva as a muddy stream fed by glaciers, emerges therefrom as a river of clear, ))ellucid water. Deltas, such as those of the Nile and Ganges, and the delta of the Rhine which forms most of the flat Dutch country, are formed in this way. If, however, the river- current be very swift, as is the case with the Amazon, for example, a delta is not formed, nor again when the scouring action of oceanic currents disturbs the water at a river's mouth. The sediment, as it is deposited on the ocean- floor, is at first loose and incoherent—shifting sand or mud—but gradually, owing to the pressure of other .sediment deposited on it, and to the ])ercolatiou through the mass of certain cementing materials, it will in time become a firm, coherent rock-substance, as sandstone or clay. Rocks formed thus by the agency of water are called aqneous rocks, while those produced by the action of the earth's heat are termed iijneous. There is an intermediate class, in which are j^laced rocks which were formed as aqueous rocks, but which by the deposition of other rocks upon them, accom- panied by the slow sinking of the ocean-floor, have gradually come to occupy deep positions in the earth's crust, and there under the influence of great heat, pressure, and perhaps steam, have been melted, and subsecpiently solidifying, have as- sumed more or less the character of tnie igneous rocks without really being so; such rocks ai'e said to be metamorphosed or altered, and they are called metamorphic rocks. Gneiss, serpen- tine, marble, and schists may be mentioned as examples. Usuall}^, it is not difficult to determine whether a rock is of aqueous o
Size: 2753px × 907px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookcontributorncs, bookdecade1880, bookyear1880
