Elementary principles of agriculture : a text book for the common schools elementaryprinci02ferg Year: 1913 Soils and Soil Management 53 being slowly but surely converted into soil. The large boulders break and fall from the cliffs, and by the weath- ing of the rains, frosts and other agencies, they are worn away. The finer particles are washed down the hillsides into the valley below, forming the rich valley soil. Soils formed in this way by the deposit of the sediment from running water are called sedimentary soils. In some cases the rocks break up and are not Fig. 33. Soil formation. R
Elementary principles of agriculture : a text book for the common schools elementaryprinci02ferg Year: 1913 Soils and Soil Management 53 being slowly but surely converted into soil. The large boulders break and fall from the cliffs, and by the weath- ing of the rains, frosts and other agencies, they are worn away. The finer particles are washed down the hillsides into the valley below, forming the rich valley soil. Soils formed in this way by the deposit of the sediment from running water are called sedimentary soils. In some cases the rocks break up and are not Fig. 33. Soil formation. Rain, frost and plants all assist in changing the moun- tains of rock into soil. After Hill. United States Geological Survey.
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