Productive farming . furrows are formed in the hillsides after hea\y swollen and muddystreams carry the soil to lowerparts of the land. Whenrivers overflow, they alwajsleave a deposit of soil whichwas carried by the water. Transported soil is any soilmoved from the place where itwas formed. It is describedby different names or terms,depending on the means bywhich it was transported; andthese different means of trans-portation leave the soil in verydifferent condition as regardsits general nature and appear-ance and use for growang out into a plowed fieldafter a hea^^y rain a
Productive farming . furrows are formed in the hillsides after hea\y swollen and muddystreams carry the soil to lowerparts of the land. Whenrivers overflow, they alwajsleave a deposit of soil whichwas carried by the water. Transported soil is any soilmoved from the place where itwas formed. It is describedby different names or terms,depending on the means bywhich it was transported; andthese different means of trans-portation leave the soil in verydifferent condition as regardsits general nature and appear-ance and use for growang out into a plowed fieldafter a hea^^y rain and seewhere httle gulleys have been worn. Follow one of theseand see how much soil was carried by the water that ranoff. Notice the size of the particles that were carried. Soil deposited by water is called alluvial. It is foundin valleys and river-beds, beds of old lakes, ponds andmarshes. (Fig. 26.) Soil deposited from ice is called drift sail. It has beenformed by the action of glaciers, which are large bodies of. Fig, 29.—A large rock split by thegrowth of a tree near Lansing, Mich. HOW SOILS ARE FORMED 49 ice moving like rivers, carrying quantities of earth androcks. The results of ancient glacial action are found inmany places. Rocks with deep scratches show the wearingand grinding effects of the moving masses of ice. Drift orglacial soil is easily recognized by the presence of roundedrocks or boulders. It is usually fertile because of the varietyof mineral substances brought from far and near. Muchdrift soil is found throughout the northern states and Canada,east of the Rocky Mountains. Two other kinds of transported soil should be , known as colluvial soil, occurs on mountain slopes andsteep-hillsides, and is the mixed mass of soil and rocks broughtdown by avalanches and landslides. Such soil is not generallyin condition to grow good crops. The other, known as wind-drifted or aeolian soil, is found in arid or semi-arid regions,that is, in places where there
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu, booksubjectagriculture
